I run dnsmasq instead of systemd-resolved on all my systems.
I recently moved my dekstop server to new hardware running xubuntu
24.04 replacing my previous system that was running xubuntu 22.04.
I installed dnsmasq and removed systemd-resolved and all seemed well
until I noticed I couldn't send E-Mail, I run a postfix 3.8.6 server
which sends outgoing E-Mail via my ISP's smarthost.
In the mail.log I was seeing lots of messages like:-
2024-06-02T00:10:30.652648+01:00 q957 postfix/smtp[8733]: 9763C3542024:
to=<ch...@isbd.co.uk>, relay=none, delay=8729, delays =8729/0.02/0/0,
dsn=4.4.3, status=deferred (Host or domain name not found. Name service error
for name=smtp-auth.mythic-beasts.com type=A: Host not found, try again)
But running 'host smtp-auth.mythic-beasts.com' returned a perfectly OK
address.
It turned out that the file /var/spool/postfix/etc/resolv.conf was:-
nameserver 127.0.0.53
options edns0 trust-ad
search zbmc.eu
Changing it to:-
nameserver 127.0.0.53
options edns0 trust-ad
search zbmc.eu
Has fixed the problem.
However I'm sure this isn't the 'right' way to do this. How do I get
postfix to pick up the resolv.conf file that is used/created by dnsmasq?
--
Chris Green
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