docker-mailserver/docs/content/config/advanced/override-defaults/postfix.md
Brennan Kinney a0ee472501
docs(chore): Normalize for consistency (#2206)
"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.

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* drive-by revisions

Mostly minor revisions or improvements to docs that aren't related to normalization effort.
2021-09-23 11:29:37 +12:00

1.3 KiB

title
Override the Default Configs | Postfix

The Postfix default configuration can easily be extended by providing a docker-data/dms/config/postfix-main.cf in postfix format. This can also be used to add configuration that is not in our default configuration.

For example, one common use of this file is for increasing the default maximum message size:

# increase maximum message size
message_size_limit = 52428800

That specific example is now supported and can be handled by setting POSTFIX_MESSAGE_SIZE_LIMIT.

!!! note

[Postfix documentation](http://www.postfix.org/documentation.html) remains the best place to find configuration options.

Each line in the provided file will be loaded into postfix.

In the same way it is possible to add a custom docker-data/dms/config/postfix-master.cf file that will override the standard master.cf. Each line in the file will be passed to postconf -P. The expected format is <service_name>/<type>/<parameter>, for example:

submission/inet/smtpd_reject_unlisted_recipient=no

Run postconf -P in the container without arguments to see the active master options.

!!! note There should be no space between the parameter and the value.

Have a look at the code for more information.