Routing Mail From a Third Party Hosted Domain That Appears to Be a Sub-Domain, to a Local Smarthost (Doc ID 1918949.1)

Last updated on SEPTEMBER 27, 2024

Applies to:

Symptoms

Using:  Messaging Server 7u3p15.

Our domain is example1.com. We also own mail.example1.com, but it is hosted by a 3rd party. A user user@example1.com has a forwarding rule to forward to user@example2.com. We have a smarthost defined on tcp_local and this all works fine and the email forwarded to user@example2.com goes thru the smarthost. The problem is that when user@example1.com tries to forward to user@mail.example1.com, it does not use the smarthost and instead uses the default gateway.

We would like any mail that is forwarded to @mail.example1.com to also use the same smarthost as @example1.com does. Again, we are not hosting mail.example1.com -- we just own it.

From these mail.log_current snippets, we can see what is happening:

  

When mail is sent to @mail.example1.com, the channels being used are tcp_intranet ->tcp_intranet, whereas when mail is sent to other outside domains, tcp_intranet -> tcp_local is being used.

The smarthost is defined ontcp_local.

Cause

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