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33 lines
1.2 KiB
Markdown
33 lines
1.2 KiB
Markdown
---
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title: 'Override the Default Configs | Postfix'
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---
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The Postfix default configuration can easily be extended by providing a `config/postfix-main.cf` in postfix format.
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This can also be used to add configuration that is not in our default configuration.
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For example, one common use of this file is for increasing the default maximum message size:
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```cf
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# increase maximum message size
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message_size_limit = 52428800
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```
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That specific example is now supported and can be handled by setting `POSTFIX_MESSAGE_SIZE_LIMIT`.
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[Postfix documentation](http://www.postfix.org/documentation.html) remains the best place to find configuration options.
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Each line in the provided file will be loaded into postfix.
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In the same way it is possible to add a custom `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:
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```cf
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submission/inet/smtpd_reject_unlisted_recipient=no
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```
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Run `postconf -P` in the container without arguments to see the active master options.
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!!! note
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There should be no space between the parameter and the value.
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Have a look at the code for more information.
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