new yahoo log message?

[Stefan Jeglinski]

I just noticed this log entry, which has been around only since Feb 2 
at 4:21AM EST; it never appeared before then, and it seems to come 
bursts that last from 1 to 3 hours, but always with a different SMTP 
number so I know it's not a repeated attempt to deliver the same 
e-mail:

22:01:21 1 SMTP-391(yahoo.com) 'From' rejected, got 421 VS5-MF 
Excessive unknown recipients - possible Open Relay 
http://help.yahoo.com/help/us/mail/spam/spam-18.html (#4.4.5)\r

It would appear that yahoo thinks I'm sending spam? Since I never 
know what tricks spammers are up to, I always wonder. Also, Yahoo has 
been making noises about new spam-fighting methods, so I never know 
what to expect from them.

I've just turned on full logging to capture it better, but in the 
meantime... any comments on what it is implying or meaning?

Stefan Jeglinski

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