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I could use some clarification….
For example, we have domain1.com and domain2.com
Currently both of these domains are located on our old mail server which will be migrated to our new mail server on cPanel at some point. domain2.com contains mailboxes. domain1.com is setup within domain2.com on our old mail server as an alias/domain forward. From: @domain1.com To: @domain2.com.