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a0ee472501
"Brief" summary/overview of changes. See the PR discussion or individual commits from the PR for more details.
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Only applies to the `docs/content/**` content (_and `setup` command_). `target/` and `test/` can be normalized at a later date.
* Normalize to `example.com`
- Domains normalized to `example.com`: `mywebserver.com`, `myserver.tld`, `domain.com`, `domain.tld`, `mydomain.net`, `my-domain.tld`, `my-domain.com`, `example.org`, `whoami.com`.
- Alternative domains normalized to `not-example.com`: `otherdomain.com`, `otherdomain.tld`, `domain2.tld`, `mybackupmx.com`, `whoareyou.org`.
- Email addresses normalized to `admin@example.com` (in `ssl.md`): `foo@bar.com`, `yourcurrentemail@gmail.com`, `email@email.com`, `admin@domain.tld`.
- Email addresses normalized to `external-account@gmail.com`: `bill@gates321boom.com`, `external@gmail.com`, `myemail@gmail.com`, `real-email-address@external-domain.com`.
- **`faq.md`:** A FAQ entry title with `sample.domain.com` changed to `subdomain.example.com`.
- **`mail-fetchmail.md`:** Config examples with FQDNs for `imap`/`pop3` used `example.com` domain for a third-party, changed to `gmail.com` as more familiar third-party/external MTA.
* Normalize config volume path
- Normalizing local config path references to `./docker-data/dms/config/`: `./config/`, `config/`, \``config`\`, `/etc/` (_volume mount src path prefix_).
- Normalize DMS volume paths to `docker-data/dms/mail-{data,state,log}`: `./mail`, `./mail-state` `./data/mail`, `./data/state`, `./data/logs`, `./data/maildata`, `./data/mailstate`, `./data/maillogs`, (_dropped/converted data volumes: `maildata`, `mailstate`_).
- Other docker images also adopt the `docker-data/{service name}/` prefix.
* `ssl.md` - Use `dms/custom-certs` where appropriate.
* Apply normalizations to README and example `docker-compose.yml`
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Common terms, sometimes interchangeably used or now invalid depending on context: `mail`, `mail container`, `mail server`, `mail-server`, `mailserver`,`docker-mailserver`, `Docker Mailserver`.
Rough transformations applied to most matches (_conditionally, depending on context_):
- 'Docker Mailserver' => '`docker-mailserver`'
- 'mail container' => '`docker-mailserver`' (_optionally retaining ' container'_)
- 'mail server' => 'mail-server' / '`docker-mailserver`'
- 'mail-server' => '`docker-mailserver`'
- 'mailserver' => 'mail-server' / '`docker-mailserver`'
Additionally I checked `docker run` (_plus `exec`, `logs`, etc, sub-commands_) and `docker-compose` commands. Often finding usage of `mail` instead of the expected `mailserver`
Additionally changes `mailserver` hostname in k8s to `mail` to align with other non-k8s examples.
---
* drive-by revisions
Mostly minor revisions or improvements to docs that aren't related to normalization effort.
90 lines
3.5 KiB
Markdown
90 lines
3.5 KiB
Markdown
---
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title: 'Mail Forwarding | Relay Hosts'
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---
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## Introduction
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Rather than having Postfix deliver mail directly, you can configure Postfix to send mail via another mail relay (smarthost). Examples include [Mailgun](https://www.mailgun.com/), [Sendgrid](https://sendgrid.com/) and [AWS SES](https://aws.amazon.com/ses/).
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Depending on the domain of the sender, you may want to send via a different relay, or authenticate in a different way.
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## Basic Configuration
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Basic configuration is done via environment variables:
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- `RELAY_HOST`: _default host to relay mail through, `empty` (aka '', or no ENV set) will disable this feature_
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- `RELAY_PORT`: _port on default relay, defaults to port 25_
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- `RELAY_USER`: _username for the default relay_
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- `RELAY_PASSWORD`: _password for the default user_
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Setting these environment variables will cause mail for all sender domains to be routed via the specified host, authenticating with the user/password combination.
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!!! warning
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For users of the previous `AWS_SES_*` variables: please update your configuration to use these new variables, no other configuration is required.
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## Advanced Configuration
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### Sender-dependent Authentication
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Sender dependent authentication is done in `docker-data/dms/config/postfix-sasl-password.cf`. You can create this file manually, or use:
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```sh
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setup.sh relay add-auth <domain> <username> [<password>]
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```
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An example configuration file looks like this:
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```txt
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@domain1.com relay_user_1:password_1
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@domain2.com relay_user_2:password_2
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```
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If there is no other configuration, this will cause Postfix to deliver email through the relay specified in `RELAY_HOST` env variable, authenticating as `relay_user_1` when sent from `domain1.com` and authenticating as `relay_user_2` when sending from `domain2.com`.
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!!! note
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To activate the configuration you must either restart the container, or you can also trigger an update by modifying a mail account.
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### Sender-dependent Relay Host
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Sender dependent relay hosts are configured in `docker-data/dms/config/postfix-relaymap.cf`. You can create this file manually, or use:
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```sh
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setup.sh relay add-domain <domain> <host> [<port>]
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```
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An example configuration file looks like this:
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```txt
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@domain1.com [relay1.org]:587
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@domain2.com [relay2.org]:2525
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```
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Combined with the previous configuration in `docker-data/dms/config/postfix-sasl-password.cf`, this will cause Postfix to deliver mail sent from `domain1.com` via `relay1.org:587`, authenticating as `relay_user_1`, and mail sent from `domain2.com` via `relay2.org:2525` authenticating as `relay_user_2`.
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!!! note
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You still have to define `RELAY_HOST` to activate the feature
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### Excluding Sender Domains
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If you want mail sent from some domains to be delivered directly, you can exclude them from being delivered via the default relay by adding them to `docker-data/dms/config/postfix-relaymap.cf` with no destination. You can also do this via:
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```sh
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setup.sh relay exclude-domain <domain>
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```
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Extending the configuration file from above:
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```txt
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@domain1.com [relay1.org]:587
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@domain2.com [relay2.org]:2525
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@domain3.com
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```
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This will cause email sent from `domain3.com` to be delivered directly.
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#### References
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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.
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[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
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