Andrew C Burnette writes:

Hi all,

(and thanks Mr. Sam for the awesome MTA software on my server for close
to a decade now!)

I get examples like this in my log file:

Aug  6 11:38:04 localhost courierd:
newmsg,id=00B1E707.4E3D5FCE.0000673E, auth=backup: dns; User
([202.109.133.181])

which invariably turns out to be a successful attempt to relay spam

Do you have a system userid named "backup"?

As in your /etc/passwd file.


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