On Tue, 4 Jun 2024, Chris Green via Postfix-users wrote:
I run dnsmasq instead of systemd-resolved on all my systems.

You need to make sure you've disabled it and whatever associated scaffolding edits resolv.conf or that you understand the mechanism.

[...]
It turned out that the file /var/spool/postfix/etc/resolv.conf was:-

   nameserver 127.0.0.53

That's an artifact of systemd-resolved and the distributions which ship it.

You may also need to understand why postfix is using /var/spool/postfix/etc/resolv.conf instead of /etc/resolv.conf. Maybe it's copying it from /etc/resolv.conf. You might use that behavior to your advantage by having it copy from some other location which you maintain.

--

Fred Morris

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