Help! Spam / relay problem with Sendmail

P

Pipo

Can anyone help me out with this.

Part 1. I am seeing daily messages in my Sendmail mail log.

[37.49.225.165] did not issue MAIL/EXPN/VRFY/ETRN during connection to IPv4
[185.100.87.191] did not issue MAIL/EXPN/VRFY/ETRN during connection to MSA

If I am correct, this means someone is trying to relay mail at my server. But not successful?
There are no lines in my log for mails being send.

Can anyone confirm there is no problem?

Part 2. Maybe this is related, but I am not sure.

I am also getting several Mailer-Daemon mails from other servers from their Mail Delivery System.

Content is: "A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:"
With may email addresses.

I think this is from email spoofing, but not through my server, because these are not in my logs.
If this is the case, it is a different problem which is insolvable.

Can anyone confirm my conclusions, so I can sleep better.
 
Very useful link. Thank you.
I am not an expert on this, but I think for me this is not the problem I have.
He gets failure warnings for the use of his email server for mails he never send.
My failure warnings are from other email servers. Because those email servers look legit, I cannot post them here.
 
You must log in or register to reply here.
Back
Top