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Brennan Kinney 2023-08-11 15:26:27 +12:00 committed by GitHub
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docs/content/config/advanced/tips/server-multiple-ip-addresses.md
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@ -4,40 +4,40 @@ title: 'Advanced | Tips | Server with multiple IP-addresses'
## Server with multiple IP-addresses
!!! warning "Only tested with docker configuration running with network-mode: host"
!!! warning "Advice not extensively tested"
This configuration has only been tested with network: host where you have direct access to the host interfaces.
This configuration has only been used with `network: host`, where you have direct access to the host interfaces.
If your host system is running multiple IPv4 and IPv6 IP-addresses, you probably have an interest to
bind outgoing SMTP connections to specific IP-addresses to ensure MX records are aligned with
PTR-records in DNS when sending emails to avoid getting blocked by SPF for example.
We can use the tricks of [overriding defaults in postfix configuration](../override-defaults/postfix.md)
by supplying a custom `docker-data/dms/config/postfix-master.cf` and `docker-data/dms/config/postfix-main.cf`.
This can be configured by [overriding the default Postfix configurations](../override-defaults/postfix.md) DMS provides. Create `postfix-master.cf` and `postfix-main.cf` files for your config volume (`docker-data/dms/config`).
In `postfix-main.cf` you'll have to set the [smtp_bind_address](https://www.postfix.org/postconf.5.html#smtp_bind_address) and [smtp_bind_address6](https://www.postfix.org/postconf.5.html#smtp_bind_address6)
In `postfix-main.cf` you'll have to set the [`smtp_bind_address`](https://www.postfix.org/postconf.5.html#smtp_bind_address) and [`smtp_bind_address6`](https://www.postfix.org/postconf.5.html#smtp_bind_address6)
to the respective IP-address on the server you want to use.
!!! info "IP-addresses shown below are reserved documentation IP-addresses by IANA, [RFC-5737](https://datatracker.ietf.org/doc/rfc5737/) and [RFC-3849](https://datatracker.ietf.org/doc/html/rfc3849)."
!!! example
Example `postfix-main.cf`:
```
```title="postfix-main.cf"
smtp_bind_address = 198.51.100.10
smtp_bind_address6 = 2001:DB8::10
```
**NOTE:** IP-addresses shown above are placeholders, using reserved documentation IP-addresses by IANA, [RFC-5737](https://datatracker.ietf.org/doc/rfc5737/) and [RFC-3849](https://datatracker.ietf.org/doc/html/rfc3849).
One problem with using `smtp_bind_address` is that the default configuration for `smtp-amavis` in
DMS needs to be updated & explicit configured to connect via loopback (localhost) to avoid using
the `smtp_bind_address` as source address when "forwarding" email for filtering via amavis.
This seems to be a better configuration than adding your bind-addresses to `mynetworks` configuration in
Postfix.
DMS needs to be updated to explicitly connect via loopback (localhost), which avoids using
the `smtp_bind_address` as source address when "forwarding" email for filtering via Amavis.
Example `postfix-master.cf`:
!!! example
```
```title="postfix-master.cf"
smtp-amavis/unix/smtp_bind_address=127.0.0.1
smtp-amavis/unix/smtp_bind_address6=::1
```
This seems to be a better approach than adding your bind-addresses to `mynetworks` parameter in
Postfix `postfix-main.cf`.