Differential MX routing by username?

Is it possible to set up MX records to route email for different users of the same domain to different email servers / IP addresses?

No. MX records inform sending MTAs where they can find receiving MTAs for domains, not users.

If you have a subset of users on a different MTA, you will need to configure your primary MTA to transport the emails for those users to the other MTA. If you have multiple MX entries, all MTAs in your MX need to know how to handle the email.


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