Rense Buijen wrote on Wed, 22 Aug 2007 16:01:09 +0200: > I think Exchange is configured the right way > in such a way that it knows what users it has on the system..
But your backup MX doesn't. As you say you are taking in all mail, forward it to primary and then bounce it back to the sender. But your primary MX doesn't know the sender! Basically *all* viruses and spam come with forged senders. So, what you do is bounce back spam and viruses to innocent bystanders. This is bad, really bad! What you should do is check on the secondary MX if a user exists and don't accept it if a user doesn't exist. This depends on the mail server you use, there are several solutions for this and it's off-topic on this list. And until you don't have such a solution in place do *not* send out *any* DSNs from your primary MX if they are for messages you got in from your secondary! Kai -- Kai Schätzl, Berlin, Germany Get your web at Conactive Internet Services: http://www.conactive.com
