[AusNOG] SMTP open relay scanning currently underway

[Heinz N]

Hi All,

Time to check that you have no open SMTP relays. There is apparently a 
scan going on from IPs all over the world looking for open SMTP relays. 
They are trying to be sneaky by doing it every 10 or 15 minutes so you 
might miss it in your logs. This appears to be a rather determined attempt 
to find all open relays.

The relay test is From:test at live.com To:therichsheickc at yahoo.com

Judging by the frequency of the scans, if you have an open relay, they 
will find it and your SMTP bandwidth will suddenly rise rather 
dramatically.

Regards,
Heinz N.