Subj : Re: ODD DNS behaviour on Pi ZERO W with Bullseye OS
To   : All
From : Computer Nerd Kev
Date : Wed Nov 19 2025 07:08:40

The Natural Philosopher <tnp@invalid.invalid> wrote:
> Seriously,m its not the server, its the DNS.
> 
> It (the PI) cant even *find* the SMTP server
> Nov 18 10:46:56 heating-controller postfix/pickup[8654]: CC05B1F270: 
> uid=0 from=<oil-monitor@heating-controller>
> Nov 18 10:46:56 heating-controller postfix/cleanup[10455]: CC05B1F270: 
> message-id=<20251118104656.CC05B1F270@heating-controller>
> Nov 18 10:46:56 heating-controller postfix/qmgr[1295]: CC05B1F270: 
> from=<oil-monitor@heating-controller>, size=387, nrcpt=1 (queue active)
> Nov 18 10:46:57 heating-controller postfix/smtp[10457]: CC05B1F270: 
> to=<superroot@templar.co.uk>, relay=none, delay=0.38, 
> delays=0.19/0.14/0.04/0, dsn=4.4.3, status=deferred (Host or domain name 
> not found. Name service error for name=vps.templar.co.uk type=MX: Host 
> not found, try again)

If it's the only network activity the thing does regularly, maybe
the WiFi interface has gone into some sort of sleep mode and the DNS
resolver isn't waiting for it to wake up. If you leave ping running
(eg. "nohup ping -s 1 vps.templar.co.uk &") to keep the interface
active, maybe it will work the first time?

Or if it doesn't change, you could set the IP address for
vps.templar.co.uk in /etc/hosts.

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