From: not@telling.you.invalid   
      
   The Natural Philosopher  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=   
   > 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=, size=387, nrcpt=1 (queue active)   
   > Nov 18 10:46:57 heating-controller postfix/smtp[10457]: CC05B1F270:   
   > to=, 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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