21 Zeilen
792 B
Markdown
21 Zeilen
792 B
Markdown
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## SNAT
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SNAT is used to change the source address of the packets sent by mailcow.
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It can be used to change the outgoing IP on systems with multiple IP addresses.
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Open `mailcow.conf`, set either or both of the following parameters:
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```
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# Use this IPv4 for outgoing connections (SNAT)
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SNAT_TO_SOURCE=1.2.3.4
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# Use this IPv6 for outgoing connections (SNAT)
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SNAT6_TO_SOURCE=dead:beef
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```
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Run `docker-compose up -d`.
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The values are read by netfilter-mailcow. netfilter-mailcow will make sure, the post-routing rules are on position 1 in the netfilter table. It does automatically delete and re-create them if they are found on another position than 1.
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Check the output of `docker-compose logs --tail=200 netfilter-mailcow` to ensure the SNAT settings have been applied.
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