Frequent DNS Requests Against SMTP Server

MickyF

New Member
Nov 18, 2025
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I've set up a custom notification target to get notified about executed tasks.

Don't know if this happens since then, but I noticed that my DNS server now logs frequent DNS request against the above configured SMTP server. This happens about every 5 minutes. However, no single mail is sent, scheduled tasks are set up at different times and frequencies.

I've already restarted postfix and upgraded to version 4.1 today. Those DNS requests do not disappear, though.

Any idea why this happens and what's the source of this behavior?

Michael