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figuring out who sent email by squirrelmail

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In trying to track down what account was being used to send spam
via squirrelmail all I had was lines like this from /var/log/maillog

Feb 27 18:12:15 mail sendmail[9844]: p1RNC9TS009844: 
from=<johngalvan@xxxxxxxxxxxxxxxxxxx>, size=1087, class=0, nrcpts=1, 
msgid=<4469.120.140.74.254.1298645519.squirrel@xxxxxxxxxxxxxxxxxxxxxxxx>, 
proto=ESMTP, daemon=MTA, relay=localhost.localdomain [127.0.0.1]
Feb 27 18:12:15 mail sendmail[9844]: p1RNC9TS009844: 
to=<xxxxxx@xxxxxxxxxx>, delay=00:00:06, mailer=relay, pri=31087, 
stat=queued

johngalvan is not a user on our system.  SO it was faked.  Is there now way 
from the msgid to figure out what logged in squirrelmail user sent this?

Eventually I was able to get an example of an actual spam message so I could 
see the full headers which shows the authorized squirrelmail user, but that 
took a long time to track down and meanwhile spam was still going out.

Is there some plugin that would log information for auditing this kind
of thing better?  I was supprised to find there is no log at all for
squirrelmail by default that tracks logins or mail sent.  Can anyone
recommend one?

Thanks


-- 
---------------------------------------------------------------
Paul Raines                email: raines at nmr.mgh.harvard.edu
MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging
149 (2301) 13th Street     Charlestown, MA 02129	    USA




The information in this e-mail is intended only for the person to whom it is
addressed. If you believe this e-mail was sent to you in error and the e-mail
contains patient information, please contact the Partners Compliance HelpLine at
http://www.partners.org/complianceline . If the e-mail was sent to you in error
but does not contain patient information, please contact the sender and properly
dispose of the e-mail.


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