Son of Beastie
My mailserver's logs contain lots of the following lines:
There are over 1,000 such entries from the same hostname/IP within a period of ten minutes or so. Is there any chance this is just a crappy misconfigured server, or is it a spammer trying to abuse my server for relaying?
<timestamp> mail sm-mta: s1H2MWNN062748: foo.bar.com [<IP address>] did not issue MAIL/EXPN/VRFY/ETRN during connection to IPv4