During the last few days I got hundreds of these:

Dec 12 09:04:08 qube3 sendmail[20950]: NOQUEUE: mrh.rcmail.com [216.54.1.19]
did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA

should I worry.

Meanwhile I changed the default rule of my firewall from accept to deny.

Most likely someone scanning you!
If it's an unknown IP, it's a good idea to DENY.

Gerald


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