Is there anyone who can help me?

Thanks

Hello,

This is not currently possible. If we find the domain locally on the box we always go straight to the spool bypassing gateways and SMTP. Unfortunately this is how the system is built. It can not be configured and it would not necessarily be easy for us to change.

There may be some weird setup that could allow you to do this, but anything would be kinda janky and prone to problems.