My Postfix log is full of repeated connections and disconnections from the
same machine:

Feb 26 11:43:41 rafa postfix/submission/smtpd[13829]: connect from 
unknown[92.118.38.42]
Feb 26 11:43:52 rafa postfix/submission/smtpd[13829]: disconnect from 
unknown[92.118.38.42]
Feb 26 11:44:04 rafa postfix/submission/smtpd[13829]: warning: hostname 
ip-38-42.ZervDNS does not resolve to address 92.118.38.42: Name or service not 
known

This repeats over and over (I already blocked this IP on firewall). I wonder
what this attacker(?) is trying to do - the client doesn't attempt AUTH or
anything (it would be logged). It just connects and disconnects. And so on
and on...
-- 
Regards,
   Jaroslaw Rafa
   r...@rafa.eu.org
--
"In a million years, when kids go to school, they're gonna know: once there
was a Hushpuppy, and she lived with her daddy in the Bathtub."

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