Here is the situation.
I am blocking all emails from my own domain on my relay server, since no
email from my organization will originate from the outside.
I think this is what is happening. Spammers are sending emails to my
ISP smtp backup server like this:
My relay server is rejecting them. The ISP smtp server is receiving the
smtp rejection and creating a postmaster bounce to me, since my email was in
the from: field. The bounced message has the original spam email attached. This means the
spammer was successful in getting me the email. I.E. one of my users could
open the attachment and allow whatever is in the email to happen. (tojan,
My question is: how do I stop this from happening?
Here is the bounce message.
From: System Administrator [mailto:firstname.lastname@example.org]
Sent: June 26, 2006 9:00 PM
Subject: Undeliverable: Roolex for you
Subject: Roolex for you
Sent: Mon, 26 Jun 2006 20:59:07 -0400
did not reach the following recipient(s):
ME on Mon, 26 Jun 2006 21:00:22 -0400
The e-mail system was unable to deliver the message, but did not report
a specific reason. Check the address and try again. If it still fails,
contact your system administrator.
< smtp.myisp.com #5.0.0 X-Postfix;
host smtp.mydomain.com[xxx.xxx.xxx.xxx] said:
550 5.7.1 Message rejected. (in reply to end of DATA command)>