[Mimedefang] "Possible SMTP attack: command=HELO/EHLO, count=3"
Joseph Brennan
brennan at columbia.edu
Thu Oct 26 15:32:21 EDT 2006
Yesterday we had 57,510 of these from 29,312 different IP addresses.
Therefore they average less than 2 a day per IP.
Many were to invalid addresses, some of them in a format that could
never have been a valid address in our domain. From a few that were
to valid addresses, and so had subject logged-- prescription drug spam.
Joseph Brennan
Lead Email Systems Engineer
Columbia University Information Technology
More information about the MIMEDefang
mailing list