hermit921 at yahoo.com
Wed Feb 4 20:06:33 GMT 2004
Postfix sends mail on to our internal mail server running sendmail on unix.
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.
>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
>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?
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