untagged messages

[hermit921]

Postfix sends mail on to our internal mail server running sendmail on unix.

hermit921


At 11:42 AM 2/4/2004, you wrote:
>This may be completely off base, since I don't know if you already posted
>your network config, but are you delivering directly to Unix accounts
>after MailScanner, or forwarding on to an Exchange box on an internal network?
>
>The reason why I ask is that here, we use MS Exchange for internal mail,
>and it seems like headers get replaced at random times by the words
>"Microsoft Mail Internet Headers 2.0" followed by a sanitized version of
>headers, which still shows the server route, but nothing useful such as
>MailScanner headers. I've heard vague rumors as to why this happens, but
>have not heard of anyone being able to fix it.
>
>
>-----Original Message-----
>From: hermit921 [mailto:hermit921 at YAHOO.COM]
>Sent: Wednesday, February 04, 2004 11:18 AM
>To: MAILSCANNER at JISCMAIL.AC.UK
>Subject: untagged messages
>
>
>I am still trying to figure out why some messages don't get tagged by
>MailScanner 4-23, postfix 2.  Every email should get tagged with at least
>one MailScanner header, but some don't.
>
>I came up with an idea.  Is this feasible:
>Spammer sets up his client to use our mail server as his smtp
>gateway.  Should work for any message addressed to a user in our domain,
>but he can't send mail outside.  So spammer addresses a message to
>usera at mydomain, with CC or BCC to userb, userc, userd, etc.  Now I get
>fuzzy....
>
>One message appears here, postfix dumps it in the hold queue.  Postfix
>splits it up at the same time, so only the original message gets the
>MailScanner headers.  Since I can't track the original, I can't verify the
>presence of headers.
>
>Am I way off?