Hello. I am setting up exchange for one of my clients and since their server is hosted at their office location I don't want to trust it with being the only mail server available.
I have a dedicated server with WHM/cPanel running at a datacenter which is far more reliable than the office location. I saw under cPanel/WHM that you can use it as a backup email server, but the documentation that I could find on this is a bit lacking in my opinion.
Has anyone used this before? From some documentation I get that if cPanel is setup as the backup it will wait for the primary mail server (exchange in this case) to come backup then it will deliver the mail to it. From other documentation I get that it will simply use the mailboxes on the server and never directly deliver email to the primary server.
Also, how to set this is up is also a bit confusing. I am aware that my primary server should have a priority of 0 and the back up of something like 10. However, I have 4 different setting types for the email server where MX records are set. These are automatic, remote, local, and backup.
So if I want to use the backup I assume I set the setting to backup then I set my exchange server to have a priority of 0 while the cpanel server has a priority of 10?
Having not tried this before and not wanting to risk having my clients not get email I would appreciate some feedback from people that have tried this before.