Bugtraq mailing list archives

Re: Mail Essentials reveals identity of first BCC recipient


From: J Leon <jimatwork () local-connect com>
Date: 24 Dec 2001 22:03:06 -0000


In-Reply-To: <15383.10630.436261.175544 () eris euroconex prv>

I've been using GFI Mail Essentials since May 2000, 
and have never seen such a thing. I've looked at 
thousands of email messages passing through my 
MES server.  I've also performed some tests to see if 
MES could do what you've seen, and could not 
duplicate the symptom.

Is it possible that the address you saw is a 
distribution list and that part of the header was sent 
from an upstream server, not actually from MES?  If I 
could see the complete header, I could try duplicate 
the problem more accurately.

I'm not intimately familiar with the RFC's, but it 
seems that an email could not be correctly delivered 
with an incorrect "for" in the header.  In fact, if the 
originating server didn't send BCC information, MES 
should never get any BCC information.  All MES sees 
is the "mail from" and "rcpt to" commands and then 
the "data" from the upstream server.

I use MES on a machine separated from the 
Exchange server, like a proxy.  Exchange sends all 
mail out to MES, and MES forwards it on.  However, 
MES can be installed directly on the Exchange server 
to give it some added capabilities.  I doubt the 
forwarding part works significantly different when 
installed on the same server compared to being 
installed alone, but it's possible.  When together, 
MES listens on 25 and Exchange listens on a 
different port.

There certainly are problems with MES, but I don't 
think this one can be blamed on MES.

J. Leon


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