Using DA POP3 together with Exchange

[Valuco]

I'm strugling with this problem for a few weeks now. Hope somebody can help me with this.

I've got a webserver with DA (of-course). On this webserver i'm hosting a domain, for example mydomain.com.

I've got 2 e-mail account on this domain:
- [email protected]
- [email protected]

Then i also have an external Exchange 2010 server. The Exchange server is taking care for another 2 e-mail adressen on the same domain.
- [email protected]
- [email protected]

Is it posible to configure DA that when an e-mail message arrives it checkes if that adres exists on the DA server, if not forward to the external IP of the Exchange server?

For example:
mail send to: [email protected] -> deliver to POP3 box on DA webserver.
mail send to: [email protected] -> doesn't exist on DA server -> forward to Exchange.

In my eyes it's not that difficult, because the server has to check if the adres exists, if not just forward to the next server in the MX records. But i don't think it's that simple because i've been google-ing for hours about this problem.

 

[nobaloney]

That's not what MX was designed for, and that's not how it works. MX uses a failover method only if the lowest server isn't answering requests. It's the sending server that manages routing by MX, the receiving server just takes what it gets.

Once you've accepted the email, you've taken responsibility for it.

You could do some custom writing of exim.conf and possibly also exim.pl; you'd need to accept the email, probably by having a so you'd have to develop something similar to how forwarding works now, to accept the mail, then to route it differently, perhaps based simply on the email address, perhaps by adding and checking for a header.

You'll get better help on this if you join and submit your question to the exim-users mailing list.

Jeff