2395 lines
55 KiB
HTML
2395 lines
55 KiB
HTML
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<!doctype html>
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<html lang="en" class="no-js">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<meta name="description" content="A fullstack but simple mail-server (SMTP, IMAP, LDAP, Anti-spam, Anti-virus, etc.) using Docker.">
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<meta name="author" content="docker-mailserver (Github Organization)">
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<link rel="canonical" href="https://docker-mailserver.github.io/docker-mailserver/edge/config/security/fail2ban/">
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<link rel="prev" href="../ssl/">
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<link rel="next" href="../mail_crypt/">
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<link rel="icon" href="../../../assets/logo/favicon-32x32.png">
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<meta name="generator" content="mkdocs-1.5.3, mkdocs-material-9.5.17">
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<title>Security | Fail2Ban - Docker Mailserver</title>
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<link rel="stylesheet" href="../../../assets/stylesheets/main.bcfcd587.min.css">
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<link rel="stylesheet" href="../../../assets/stylesheets/palette.06af60db.min.css">
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<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CRoboto+Mono:400,400i,700,700i&display=fallback">
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<style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style>
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<link rel="stylesheet" href="../../../assets/css/customizations.css">
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<script>__md_scope=new URL("../../..",location),__md_hash=e=>[...e].reduce((e,_)=>(e<<5)-e+_.charCodeAt(0),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script>
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</head>
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<body dir="ltr" data-md-color-scheme="default" data-md-color-primary="indigo" data-md-color-accent="indigo">
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<label class="md-overlay" for="__drawer"></label>
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<div data-md-component="skip">
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<a href="#configuration" class="md-skip">
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Skip to content
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</a>
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</div>
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<div data-md-component="announce">
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<div data-md-color-scheme="default" data-md-component="outdated" hidden>
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<header class="md-header" data-md-component="header">
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<nav class="md-header__inner md-grid" aria-label="Header">
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<a href="../../.." title="Docker Mailserver" class="md-header__button md-logo" aria-label="Docker Mailserver" data-md-component="logo">
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<img src="../../../assets/logo/dmo-logo-white.min.svg" alt="logo">
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</a>
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<label class="md-header__button md-icon" for="__drawer">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M3 6h18v2H3V6m0 5h18v2H3v-2m0 5h18v2H3v-2Z"/></svg>
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<div class="md-header__title" data-md-component="header-title">
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<div class="md-header__ellipsis">
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<div class="md-header__topic">
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<span class="md-ellipsis">
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Docker Mailserver
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</span>
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</div>
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<div class="md-header__topic" data-md-component="header-topic">
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<span class="md-ellipsis">
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Security | Fail2Ban
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<form class="md-header__option" data-md-component="palette">
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<input class="md-option" data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme="default" data-md-color-primary="indigo" data-md-color-accent="indigo" aria-label="Switch to dark mode" type="radio" name="__palette" id="__palette_0">
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<label class="md-header__button md-icon" title="Switch to dark mode" for="__palette_1" hidden>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="m17.75 4.09-2.53 1.94.91 3.06-2.63-1.81-2.63 1.81.91-3.06-2.53-1.94L12.44 4l1.06-3 1.06 3 3.19.09m3.5 6.91-1.64 1.25.59 1.98-1.7-1.17-1.7 1.17.59-1.98L15.75 11l2.06-.05L18.5 9l.69 1.95 2.06.05m-2.28 4.95c.83-.08 1.72 1.1 1.19 1.85-.32.45-.66.87-1.08 1.27C15.17 23 8.84 23 4.94 19.07c-3.91-3.9-3.91-10.24 0-14.14.4-.4.82-.76 1.27-1.08.75-.53 1.93.36 1.85 1.19-.27 2.86.69 5.83 2.89 8.02a9.96 9.96 0 0 0 8.02 2.89m-1.64 2.02a12.08 12.08 0 0 1-7.8-3.47c-2.17-2.19-3.33-5-3.49-7.82-2.81 3.14-2.7 7.96.31 10.98 3.02 3.01 7.84 3.12 10.98.31Z"/></svg>
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<input class="md-option" data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme="slate" data-md-color-primary="indigo" data-md-color-accent="blue" aria-label="Switch to light mode" type="radio" name="__palette" id="__palette_1">
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<label class="md-header__button md-icon" title="Switch to light mode" for="__palette_0" hidden>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 7a5 5 0 0 1 5 5 5 5 0 0 1-5 5 5 5 0 0 1-5-5 5 5 0 0 1 5-5m0 2a3 3 0 0 0-3 3 3 3 0 0 0 3 3 3 3 0 0 0 3-3 3 3 0 0 0-3-3m0-7 2.39 3.42C13.65 5.15 12.84 5 12 5c-.84 0-1.65.15-2.39.42L12 2M3.34 7l4.16-.35A7.2 7.2 0 0 0 5.94 8.5c-.44.74-.69 1.5-.83 2.29L3.34 7m.02 10 1.76-3.77a7.131 7.131 0 0 0 2.38 4.14L3.36 17M20.65 7l-1.77 3.79a7.023 7.023 0 0 0-2.38-4.15l4.15.36m-.01 10-4.14.36c.59-.51 1.12-1.14 1.54-1.86.42-.73.69-1.5.83-2.29L20.64 17M12 22l-2.41-3.44c.74.27 1.55.44 2.41.44.82 0 1.63-.17 2.37-.44L12 22Z"/></svg>
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</label>
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</form>
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<script>var media,input,key,value,palette=__md_get("__palette");if(palette&&palette.color){"(prefers-color-scheme)"===palette.color.media&&(media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']"),palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent"));for([key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script>
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<label class="md-header__button md-icon" for="__search">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.516 6.516 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5Z"/></svg>
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</label>
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<div class="md-search" data-md-component="search" role="dialog">
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<label class="md-search__overlay" for="__search"></label>
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<div class="md-search__inner" role="search">
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<form class="md-search__form" name="search">
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<input type="text" class="md-search__input" name="query" aria-label="Search" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="search-query" required>
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<label class="md-search__icon md-icon" for="__search">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.516 6.516 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5Z"/></svg>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12Z"/></svg>
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</label>
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<nav class="md-search__options" aria-label="Search">
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<button type="reset" class="md-search__icon md-icon" title="Clear" aria-label="Clear" tabindex="-1">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M19 6.41 17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12 19 6.41Z"/></svg>
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</button>
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</nav>
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</form>
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<div class="md-search__output">
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<div class="md-search__scrollwrap" data-md-scrollfix>
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<div class="md-search-result" data-md-component="search-result">
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<div class="md-search-result__meta">
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Initializing search
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</div>
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<ol class="md-search-result__list" role="presentation"></ol>
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</div>
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</div>
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</div>
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<div class="md-header__source">
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<a href="https://github.com/docker-mailserver/docker-mailserver" title="Go to repository" class="md-source" data-md-component="source">
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<div class="md-source__icon md-icon">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 496 512"><!--! Font Awesome Free 6.5.1 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2023 Fonticons, Inc.--><path d="M165.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6zm-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3zm44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9zM244.8 8C106.1 8 0 113.3 0 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C428.2 457.8 496 362.9 496 252 496 113.3 383.5 8 244.8 8zM97.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1zm-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7zm32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1zm-11.4-14.7c-1.6 1-1.6 3.6 0 5.9 1.6 2.3 4.3 3.3 5.6 2.3 1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2z"/></svg>
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</div>
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<div class="md-source__repository">
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docker-mailserver
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</div>
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</a>
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</div>
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</nav>
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</header>
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<div class="md-container" data-md-component="container">
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<nav class="md-tabs" aria-label="Tabs" data-md-component="tabs">
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<div class="md-grid">
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<ul class="md-tabs__list">
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<li class="md-tabs__item">
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<a href="../../.." class="md-tabs__link">
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Home
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../../../introduction/" class="md-tabs__link">
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Introduction
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../../../usage/" class="md-tabs__link">
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Usage
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</a>
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</li>
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<li class="md-tabs__item md-tabs__item--active">
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<a href="../../environment/" class="md-tabs__link">
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Configuration
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../../../examples/tutorials/basic-installation/" class="md-tabs__link">
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Examples
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../../../faq/" class="md-tabs__link">
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FAQ
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../../../contributing/general/" class="md-tabs__link">
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Contributing
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="https://hub.docker.com/r/mailserver/docker-mailserver/" class="md-tabs__link">
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<span class="icon-external-link"></span>DockerHub
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="https://github.com/docker-mailserver/docker-mailserver/pkgs/container/docker-mailserver" class="md-tabs__link">
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<span class="icon-external-link"></span>GHCR
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</a>
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</li>
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</ul>
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</div>
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</nav>
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<main class="md-main" data-md-component="main">
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<div class="md-main__inner md-grid">
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<div class="md-sidebar md-sidebar--primary" data-md-component="sidebar" data-md-type="navigation" >
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<div class="md-sidebar__scrollwrap">
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<div class="md-sidebar__inner">
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<nav class="md-nav md-nav--primary md-nav--lifted" aria-label="Navigation" data-md-level="0">
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<label class="md-nav__title" for="__drawer">
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<a href="../../.." title="Docker Mailserver" class="md-nav__button md-logo" aria-label="Docker Mailserver" data-md-component="logo">
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<img src="../../../assets/logo/dmo-logo-white.min.svg" alt="logo">
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</a>
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Docker Mailserver
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</label>
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<div class="md-nav__source">
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<a href="https://github.com/docker-mailserver/docker-mailserver" title="Go to repository" class="md-source" data-md-component="source">
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<div class="md-source__icon md-icon">
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<label class="md-nav__title" for="__nav_4_8_2">
|
|
<span class="md-nav__icon md-icon"></span>
|
|
Maintenance
|
|
</label>
|
|
<ul class="md-nav__list" data-md-scrollfix>
|
|
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<li class="md-nav__item">
|
|
<a href="../../advanced/maintenance/update-and-cleanup/" class="md-nav__link">
|
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|
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|
|
<span class="md-ellipsis">
|
|
Update and Cleanup
|
|
</span>
|
|
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|
|
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</a>
|
|
</li>
|
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</ul>
|
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</nav>
|
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</li>
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<li class="md-nav__item md-nav__item--nested">
|
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<input class="md-nav__toggle md-toggle md-toggle--indeterminate" type="checkbox" id="__nav_4_8_3" >
|
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|
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<label class="md-nav__link" for="__nav_4_8_3" id="__nav_4_8_3_label" tabindex="0">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Override the Default Configs
|
|
</span>
|
|
|
|
|
|
<span class="md-nav__icon md-icon"></span>
|
|
</label>
|
|
|
|
<nav class="md-nav" data-md-level="3" aria-labelledby="__nav_4_8_3_label" aria-expanded="false">
|
|
<label class="md-nav__title" for="__nav_4_8_3">
|
|
<span class="md-nav__icon md-icon"></span>
|
|
Override the Default Configs
|
|
</label>
|
|
<ul class="md-nav__list" data-md-scrollfix>
|
|
|
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|
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|
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|
|
<li class="md-nav__item">
|
|
<a href="../../advanced/override-defaults/dovecot/" class="md-nav__link">
|
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|
|
|
|
<span class="md-ellipsis">
|
|
Dovecot
|
|
</span>
|
|
|
|
|
|
</a>
|
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</li>
|
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<li class="md-nav__item">
|
|
<a href="../../advanced/override-defaults/postfix/" class="md-nav__link">
|
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|
|
|
|
<span class="md-ellipsis">
|
|
Postfix
|
|
</span>
|
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|
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|
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</a>
|
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</li>
|
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<li class="md-nav__item">
|
|
<a href="../../advanced/override-defaults/user-patches/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Modifications via Script
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
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</ul>
|
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</nav>
|
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</li>
|
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<li class="md-nav__item">
|
|
<a href="../../advanced/auth-ldap/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
LDAP Authentication
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
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|
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<li class="md-nav__item">
|
|
<a href="../../advanced/auth-oauth2/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
OAuth2 Authentication
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
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|
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<li class="md-nav__item">
|
|
<a href="../../advanced/mail-sieve/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Email Filtering with Sieve
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
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|
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<li class="md-nav__item">
|
|
<a href="../../advanced/mail-fetchmail/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Email Gathering with Fetchmail
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
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|
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<li class="md-nav__item">
|
|
<a href="../../advanced/mail-getmail/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Email Gathering with Getmail
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item md-nav__item--nested">
|
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|
|
|
|
|
|
|
|
|
|
<input class="md-nav__toggle md-toggle md-toggle--indeterminate" type="checkbox" id="__nav_4_8_9" >
|
|
|
|
|
|
<label class="md-nav__link" for="__nav_4_8_9" id="__nav_4_8_9_label" tabindex="0">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Email Forwarding
|
|
</span>
|
|
|
|
|
|
<span class="md-nav__icon md-icon"></span>
|
|
</label>
|
|
|
|
<nav class="md-nav" data-md-level="3" aria-labelledby="__nav_4_8_9_label" aria-expanded="false">
|
|
<label class="md-nav__title" for="__nav_4_8_9">
|
|
<span class="md-nav__icon md-icon"></span>
|
|
Email Forwarding
|
|
</label>
|
|
<ul class="md-nav__list" data-md-scrollfix>
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../advanced/mail-forwarding/relay-hosts/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Relay Hosts
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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|
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<li class="md-nav__item">
|
|
<a href="../../advanced/mail-forwarding/aws-ses/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
AWS SES
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
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|
|
|
|
|
|
|
|
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|
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|
|
<li class="md-nav__item">
|
|
<a href="../../advanced/mail-forwarding/gmail-smtp/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Configure Gmail as a relay host
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
</ul>
|
|
</nav>
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
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|
|
|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../advanced/full-text-search/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Full-Text Search
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
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|
|
|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../advanced/kubernetes/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Kubernetes
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
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|
|
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|
|
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|
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|
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|
|
<li class="md-nav__item">
|
|
<a href="../../advanced/ipv6/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
IPv6
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
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|
|
|
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|
|
|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../advanced/podman/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Podman
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../../advanced/dovecot-master-accounts/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Dovecot Master Accounts
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
</ul>
|
|
</nav>
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
</ul>
|
|
</nav>
|
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</li>
|
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|
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<li class="md-nav__item md-nav__item--nested">
|
|
|
|
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|
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|
|
|
|
|
<input class="md-nav__toggle md-toggle md-toggle--indeterminate" type="checkbox" id="__nav_5" >
|
|
|
|
|
|
<label class="md-nav__link" for="__nav_5" id="__nav_5_label" tabindex="0">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Examples
|
|
</span>
|
|
|
|
|
|
<span class="md-nav__icon md-icon"></span>
|
|
</label>
|
|
|
|
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_5_label" aria-expanded="false">
|
|
<label class="md-nav__title" for="__nav_5">
|
|
<span class="md-nav__icon md-icon"></span>
|
|
Examples
|
|
</label>
|
|
<ul class="md-nav__list" data-md-scrollfix>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
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|
|
<li class="md-nav__item md-nav__item--nested">
|
|
|
|
|
|
|
|
|
|
|
|
<input class="md-nav__toggle md-toggle md-toggle--indeterminate" type="checkbox" id="__nav_5_1" >
|
|
|
|
|
|
<label class="md-nav__link" for="__nav_5_1" id="__nav_5_1_label" tabindex="0">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Tutorials
|
|
</span>
|
|
|
|
|
|
<span class="md-nav__icon md-icon"></span>
|
|
</label>
|
|
|
|
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_5_1_label" aria-expanded="false">
|
|
<label class="md-nav__title" for="__nav_5_1">
|
|
<span class="md-nav__icon md-icon"></span>
|
|
Tutorials
|
|
</label>
|
|
<ul class="md-nav__list" data-md-scrollfix>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../../../examples/tutorials/basic-installation/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Basic Installation
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../../../examples/tutorials/mailserver-behind-proxy/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Mailserver behind Proxy
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../../../examples/tutorials/crowdsec/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Crowdsec
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
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|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../../examples/tutorials/docker-build/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Building your own Docker image
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../../../examples/tutorials/blog-posts/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Blog Posts
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
</ul>
|
|
</nav>
|
|
|
|
</li>
|
|
|
|
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|
|
|
|
|
|
|
<li class="md-nav__item md-nav__item--nested">
|
|
|
|
|
|
|
|
|
|
|
|
<input class="md-nav__toggle md-toggle md-toggle--indeterminate" type="checkbox" id="__nav_5_2" >
|
|
|
|
|
|
<label class="md-nav__link" for="__nav_5_2" id="__nav_5_2_label" tabindex="0">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Use Cases
|
|
</span>
|
|
|
|
|
|
<span class="md-nav__icon md-icon"></span>
|
|
</label>
|
|
|
|
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_5_2_label" aria-expanded="false">
|
|
<label class="md-nav__title" for="__nav_5_2">
|
|
<span class="md-nav__icon md-icon"></span>
|
|
Use Cases
|
|
</label>
|
|
<ul class="md-nav__list" data-md-scrollfix>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../../../examples/use-cases/forward-only-mailserver-with-ldap-authentication/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Forward-Only Mail-Server with LDAP
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../../../examples/use-cases/imap-folders/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Customize IMAP Folders
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../../../examples/use-cases/ios-mail-push-support/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
iOS Mail Push Support
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../../examples/use-cases/auth-lua/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Lua Authentication
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
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|
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|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../../examples/use-cases/bind-smtp-network-interface/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Bind outbound SMTP to a specific network
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
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</ul>
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<h1>Fail2Ban</h1>
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<div class="admonition quote">
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<p class="admonition-title">What is Fail2Ban (F2B)?</p>
|
|
<p>Fail2ban is an intrusion prevention software framework. Written in the Python programming language, it is designed to prevent against brute-force attacks. It is able to run on POSIX systems that have an interface to a packet-control system or firewall installed locally, such as [NFTables] or TCP Wrapper.</p>
|
|
<p><a href="https://en.wikipedia.org/wiki/Fail2ban">Source</a></p>
|
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</div>
|
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<h2 id="configuration"><a class="toclink" href="#configuration">Configuration</a></h2>
|
|
<div class="admonition warning">
|
|
<p class="admonition-title">Warning</p>
|
|
<p>DMS must be launched with the <code>NET_ADMIN</code> capability in order to be able to install the NFTables rules that actually ban IP addresses. Thus, either include <code>--cap-add=NET_ADMIN</code> in the <code>docker run</code> command, or the equivalent in the <code>compose.yaml</code>:</p>
|
|
<div class="highlight"><pre><span></span><code><span class="nt">cap_add</span><span class="p">:</span>
|
|
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">NET_ADMIN</span>
|
|
</code></pre></div>
|
|
</div>
|
|
<div class="admonition bug">
|
|
<p class="admonition-title">Running Fail2Ban on Older Kernels</p>
|
|
<p>DMS configures F2B to use NFTables, not IPTables (legacy). We have observed that older systems, for example NAS systems, do not support the modern NFTables rules. You will need to configure F2B to use legacy IPTables again, for example with the <a href="https://github.com/docker-mailserver/docker-mailserver/blob/master/config-examples/fail2ban-jail.cf"><code>fail2ban-jail.cf</code></a>, see the <a href="#custom-files">section on configuration further down below</a>.</p>
|
|
</div>
|
|
<h3 id="dms-defaults"><a class="toclink" href="#dms-defaults">DMS Defaults</a></h3>
|
|
<p>DMS will automatically ban IP addresses of hosts that have generated 6 failed attempts over the course of the last week. The bans themselves last for one week. The Postfix jail is configured to use <code>mode = extra</code> in DMS.</p>
|
|
<h3 id="custom-files"><a class="toclink" href="#custom-files">Custom Files</a></h3>
|
|
<div class="admonition question">
|
|
<p class="admonition-title">What is <a href="../../advanced/optional-config/#volumes-config"><code>docker-data/dms/config/</code></a>?</p>
|
|
</div>
|
|
<p>This following configuration files inside the <code>docker-data/dms/config/</code> volume will be copied inside the container during startup</p>
|
|
<ol>
|
|
<li><code>fail2ban-jail.cf</code> is copied to <code>/etc/fail2ban/jail.d/user-jail.local</code><ul>
|
|
<li>with this file, you can adjust the configuration of individual jails and their defaults</li>
|
|
<li>there is an example provided <a href="https://github.com/docker-mailserver/docker-mailserver/blob/master/config-examples/fail2ban-jail.cf">in our repository on GitHub</a></li>
|
|
</ul>
|
|
</li>
|
|
<li><code>fail2ban-fail2ban.cf</code> is copied to <code>/etc/fail2ban/fail2ban.local</code><ul>
|
|
<li>with this file, you can adjust F2B behavior in general</li>
|
|
<li>there is an example provided <a href="https://github.com/docker-mailserver/docker-mailserver/blob/master/config-examples/fail2ban-fail2ban.cf">in our repository on GitHub</a></li>
|
|
</ul>
|
|
</li>
|
|
</ol>
|
|
<h3 id="viewing-all-bans"><a class="toclink" href="#viewing-all-bans">Viewing All Bans</a></h3>
|
|
<p>When just running</p>
|
|
<div class="highlight"><pre><span></span><code>setup<span class="w"> </span>fail2ban
|
|
</code></pre></div>
|
|
<p>the script will show all banned IP addresses.</p>
|
|
<p>To get a more detailed <code>status</code> view, run</p>
|
|
<div class="highlight"><pre><span></span><code>setup<span class="w"> </span>fail2ban<span class="w"> </span>status
|
|
</code></pre></div>
|
|
<h3 id="managing-bans"><a class="toclink" href="#managing-bans">Managing Bans</a></h3>
|
|
<p>You can manage F2B with the <code>setup</code> script. The usage looks like this:</p>
|
|
<div class="highlight"><pre><span></span><code>docker<span class="w"> </span><span class="nb">exec</span><span class="w"> </span><CONTAINER<span class="w"> </span>NAME><span class="w"> </span>setup<span class="w"> </span>fail2ban<span class="w"> </span><span class="o">[</span><ban<span class="p">|</span>unban><span class="w"> </span><IP><span class="o">]</span>
|
|
</code></pre></div>
|
|
<h3 id="viewing-the-log-file"><a class="toclink" href="#viewing-the-log-file">Viewing the Log File</a></h3>
|
|
<div class="highlight"><pre><span></span><code>docker<span class="w"> </span><span class="nb">exec</span><span class="w"> </span><CONTAINER<span class="w"> </span>NAME><span class="w"> </span>setup<span class="w"> </span>fail2ban<span class="w"> </span>log
|
|
</code></pre></div>
|
|
<h2 id="running-inside-a-rootless-container"><a class="toclink" href="#running-inside-a-rootless-container">Running Inside A Rootless Container</a></h2>
|
|
<p><a href="https://github.com/rootless-containers/rootlesskit"><code>RootlessKit</code></a> is the <em>fakeroot</em> implementation for supporting <em>rootless mode</em> in Docker and Podman. By default, RootlessKit uses the <a href="https://github.com/rootless-containers/rootlesskit/blob/v0.14.5/docs/port.md#port-drivers"><code>builtin</code> port forwarding driver</a>, which does not propagate source IP addresses.</p>
|
|
<p>It is necessary for F2B to have access to the real source IP addresses in order to correctly identify clients. This is achieved by changing the port forwarding driver to <a href="https://github.com/rootless-containers/slirp4netns"><code>slirp4netns</code></a>, which is slower than the builtin driver but does preserve the real source IPs.</p>
|
|
<div class="tabbed-set tabbed-alternate" data-tabs="1:2"><input checked="checked" id="docker" name="__tabbed_1" type="radio" /><input id="podman" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="docker">Docker</label><label for="podman">Podman</label></div>
|
|
<div class="tabbed-content">
|
|
<div class="tabbed-block">
|
|
<p>For <a href="https://docs.docker.com/engine/security/rootless">rootless mode</a> in Docker, create <code>~/.config/systemd/user/docker.service.d/override.conf</code> with the following content:</p>
|
|
<div class="admonition danger inline end">
|
|
<p class="admonition-title">Danger</p>
|
|
<p>This changes the port driver for all rootless containers managed by Docker. Per container configuration is not supported, if you need that consider Podman instead.</p>
|
|
</div>
|
|
<div class="highlight"><pre><span></span><code><span class="k">[Service]</span>
|
|
<span class="na">Environment</span><span class="o">=</span><span class="s">"DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER=slirp4netns"</span>
|
|
</code></pre></div>
|
|
<p>And then restart the daemon:</p>
|
|
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>systemctl<span class="w"> </span>--user<span class="w"> </span>daemon-reload
|
|
<span class="gp">$ </span>systemctl<span class="w"> </span>--user<span class="w"> </span>restart<span class="w"> </span>docker
|
|
</code></pre></div>
|
|
</div>
|
|
<div class="tabbed-block">
|
|
<p><a href="https://github.com/containers/podman/blob/v3.4.1/docs/source/markdown/podman-run.1.md#--networkmode---net">Rootless Podman</a> requires adding the value <code>slirp4netns:port_handler=slirp4netns</code> to the <code>--network</code> CLI option, or <code>network_mode</code> setting in your <code>compose.yaml</code>:</p>
|
|
<div class="admonition example">
|
|
<p class="admonition-title">Example</p>
|
|
<div class="highlight"><pre><span></span><code><span class="nt">services</span><span class="p">:</span>
|
|
<span class="w"> </span><span class="nt">mailserver</span><span class="p">:</span>
|
|
<span class="w"> </span><span class="nt">network_mode</span><span class="p">:</span><span class="w"> </span><span class="s">"slirp4netns:port_handler=slirp4netns"</span>
|
|
<span class="w"> </span><span class="nt">environment</span><span class="p">:</span>
|
|
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ENABLE_FAIL2BAN=1</span>
|
|
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">NETWORK_INTERFACE=tap0</span>
|
|
<span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">...</span>
|
|
</code></pre></div>
|
|
</div>
|
|
<p>You must also add the ENV <code>NETWORK_INTERFACE=tap0</code>, because Podman uses a <a href="https://github.com/containers/podman/blob/v3.4.1/libpod/networking_slirp4netns.go#L264">hard-coded interface name</a> for <code>slirp4netns</code>. <code>slirp4netns</code> is not compatible with user-defined networks!</p>
|
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</div>
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</div>
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</div>
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</article>
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<p>© <a href="https://github.com/docker-mailserver"><em>Docker Mailserver Organization</em></a><br/><span>This project is licensed under the MIT license.</span></p>
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