On Tue, Jun 04, 2024 at 10:00:28AM +0100, Chris Green via Postfix-users wrote:
> 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?
>
Ooops!!!
That should be Changing it to:-
nameserver 127.0.0.1
options edns0 trust-ad
search zbmc.eu
of course!
On investigating further it seems that on older systems where I have
done this (moved from systemd-resolved to dnsmasq) I have simply
hand-edited /etc/resolv.conf and then postfix copies that version to
/var/spool/postfix/etc/resolv.conf and all is well.
So, is that as it should be?
--
Chris Green
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