Is it possible to configure a Linux mail server (we're running exim) to forward unhandled emails to another server? Here's an example of what I'm trying to accomplish:
- an email get's send to email@example.com
- the MX record for domain.com points to server1 so the email goes to server1
- if server1 doesn't have an email forward or mailbox for firstname.lastname@example.org it forwards the email to server2 that receives the email as if it was originally sent to it (as if the MX record pointed to server2 directly)
Is something like this possible? If it is, any information you can provide on how to accomplish this is highly appreciated.