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https://github.com/docker-mailserver/docker-mailserver
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36 lines
1.8 KiB
Markdown
36 lines
1.8 KiB
Markdown
---
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title: 'Override the Default Configs | Postfix'
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---
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[Our default Postfix configuration](https://github.com/docker-mailserver/docker-mailserver/blob/master/target/postfix/main.cf) can easily be extended to add parameters or modify existing ones by providing a `docker-data/dms/config/postfix-main.cf`. This file uses the same format as Postfix `main.cf` does ([See official docs](http://www.postfix.org/postconf.5.html) for all parameters and syntax rules).
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!!! example "Example"
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One can easily increase the [backwards-compatibility level](http://www.postfix.org/postconf.5.html#compatibility_level) and set new Postscreen options:
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```cf
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# increase the compatibility level from 2 (default) to 3
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compatibility_level = 3
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# set a threshold value for Spam detection
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postscreen_dnsbl_threshold = 4
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```
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!!! help "How are your changes applied?"
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The custom configuration you supply is appended to the default configuration located at `/etc/postfix/main.cf`, and then `postconf -nf` is run to remove earlier duplicate entries that have since been replaced. This happens early during container startup before Postfix is started.
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---
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Similarly, it is possible to add a custom `docker-data/dms/config/postfix-master.cf` file that will override the standard `master.cf`. **Note**: Each line in this file will be passed to `postconf -P`, i.e. **the file is not appended as a whole** to `/etc/postfix/master.cf` like `docker-data/dms/config/postfix-main.cf`! The expected format is `<service_name>/<type>/<parameter>`, for example:
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```cf
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# adjust the submission "reject_unlisted_recipient" option
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submission/inet/smtpd_reject_unlisted_recipient=no
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```
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!!! attention
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There should be no space between the parameter and the value.
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Run `postconf -Mf` in the container without arguments to see the active master options.
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