Postfix is not forwarding emails from domains hosted on the same server

Posted December 14, 2017 1.5k views

Hello, recently we started facing an issue. We are using Postfix and Dovecot on Centos.

If i send an email to a domain hosted on the same server(@domain1 –> @domain2 both hosted on the same server), forward does not work.
If i send an email from a domain hosted on our server to an email at the same domain(@domain1 –> @domain1), forward works.
If i send an email from an external domain forward also works.

Could anyone be of any help? I cannot figure it out for the past few hours.

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emails from @domain1 to @domain2 directly work just fine. Just not the forward option.