grep filters to block open relay

hermit921 hermit921 at
Thu Mar 23 22:28:23 GMT 2006

My company put in an Exchange server, which got listed as an open 
relay.  They can't or won't configure Exchange to accept mail only if the 
recipient address is valid, and they won't put MailScanner in front of 
Exchange to do that.  Please accept this, don't comment, move on.

To block open relay functionality, they put pattern matching into place, so 
destination email addresses such as the ones used by are rejected.  I had never heard of this approach 
before.  It blocks some legitimate email, of course.  Is this a common 
practice, or even a rare practice?  Any background information is appreciated.


More information about the MailScanner mailing list