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Is it possible to configure postfix to relay email to a new server for only some addresses without changing the address.

I'm testing a new email server (in this case, Office365). I want to test with a user [email protected] who is currently receiving email locally. I want to configure postfix to send [email protected] email to example-com.mail.protection.outlook.com without changing the address ([email protected]). I want to do this to verify delivery before changing the MX record for the domain example.com.

EDIT

Thank you for pointing me to the same question asked previously. Given that information, I was able to figure out the steps. Here's what I did:

  • Edit the file /etc/postfix/main.cf
  • Add the following line near TRANSPORT MAP:

transport_maps = hash:/etc/postfix/transport

  • Run "postfix reload" to take new setting.

  • Edit the file /etc/postfix/transport

  • Add the following line:

[email protected] smtp:domain.mail.protection.outlook.com:25

  • Run "postmap /etc/postfix/transport" to create the hash.
  • Verify that the solution work.
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