Fix some documentation links (#2426)

README.md

@@ -9,7 +9,9 @@
 [documentation::badge]: https://img.shields.io/badge/DOCUMENTATION-GH%20PAGES-0078D4?style=for-the-badge&logo=git&logoColor=white
 [documentation::web]: https://docker-mailserver.github.io/docker-mailserver/edge/
 
-A production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.). Only configuration files, no SQL database. Keep it simple and versioned. Easy to [deploy](#usage) and upgrade. [Documentation][documentation::web] via MkDocs. [Why this image was created](https://tvi.al/simple-mail-server-with-docker/).
+A production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.). Only configuration files, no SQL database. Keep it simple and versioned. Easy to [deploy](#usage) and upgrade. [Documentation][documentation::web] via MkDocs.
+
+Originally created by @tomav, docker-mailserver is now maintained by volunteers since January 2021.
 
 If you have issues, read the full `README` **and** the [documentation][documentation::web] **for your version** (default is `edge`) first **before opening an issue**. The issue tracker is for issues, not for personal support.
 

docs/content/config/advanced/mail-forwarding/relay-hosts.md

@@ -81,9 +81,3 @@ Extending the configuration file from above:
 ```
 
 This will cause email sent from `domain3.com` to be delivered directly.
-
-#### References
-
-Thanks to the author of [this article][guide-relayhost-mailgun] for the inspiration. This is also worth reading to understand a bit more about how to set up Mailgun to work with this.
-
-[guide-relayhost-mailgun]: https://community.rackspace.com/products/f/email-products-forum/3897/how-to-setup-postfix-with-a-mailgun-smtp-relay-when-using-multiple-domains

docs/content/config/advanced/mail-sieve.md

@@ -100,4 +100,4 @@ All user defined sieve scripts that are managed by ManageSieve are stored in the
 The extension is known to work with the following ManageSieve clients:
 
 - **[Sieve Editor](https://github.com/thsmi/sieve)**  a portable standalone application based on the former Thunderbird plugin.
-- **[Kmail](https://kontact.kde.org/components/kmail.html)**  the mail client of [KDE](https://kde.org/)'s Kontact Suite.
+- **[Kmail](https://kontact.kde.org/components/kmail/)**  the mail client of [KDE](https://kde.org/)'s Kontact Suite.

docs/content/config/user-management/aliases.md

@@ -29,7 +29,7 @@ Additional regexp aliases can be configured by placing them into `docker-data/dm
 
 ## Address Tags (Extension Delimiters) an Alternative to Aliases
 
-Postfix supports so-called address tags, in the form of plus (+) tags - i.e. `address+tag@example.com` will end up at `address@example.com`. This is configured by default and the (configurable !) separator is set to `+`. For more info, see [How to use Address Tagging (`user+tag@example.com`) with Postfix](https://www.stevejenkins.com/blog/2011/03/how-to-use-address-tagging-usertagexample-com-with-postfix/) and the [official documentation](http://www.postfix.org/postconf.5.html#recipient_delimiter).
+Postfix supports so-called address tags, in the form of plus (+) tags - i.e. `address+tag@example.com` will end up at `address@example.com`. This is configured by default and the (configurable !) separator is set to `+`. For more info, see the [official documentation](http://www.postfix.org/postconf.5.html#recipient_delimiter).
 
 !!! note
 

docs/content/examples/tutorials/blog-posts.md

@@ -5,5 +5,4 @@ title: 'Tutorials | Blog Posts'
 This site lists blog entries that write about the project. If you blogged about `docker-mailserver` let us know so we can add it here!
 
 - [Installing docker-mailserver](https://lowtek.ca/roo/2021/installing-docker-mailserver/) by [@andrewlow](https://github.com/andrewlow)
-- [Simple mail-server with docker](https://tvi.al/simple-mail-server-with-docker/) by [@tomav](https://github.com/tomav)
 - [Self hosted mail-server](https://www.ifthenel.se/self-hosted-mail-server/) by [@matrixes](https://github.com/matrixes)