I have a production and DR site. The DR site is using Double-Take to replicate the server.
During testing at the DR site with a replica of the server, no Emails can be sent outside.
Internal mail is fine.
DNS is working fine.
telnet is not working well ( but it is not working well on the production server either ), although from other machines it appears OK.
Router is not forwarding port 25 for incoming at the DR site, but this has never affected outgoing mail.
Production site is fine.
MX records exist for both sites with reverse PTR.
Since the DR site is the same AD and everything as the production site, I am at a loss to explain the behavior.
I have been reading about similar issues for 3 days, and still do not see a solution.
Any help appreciated