[courier-users] Question about Relaying mail to other hosts

Hello:

I have the following situation:

My organisation has a courier mailserver which forwards its external
mail to our upstream provider's email server for delivery,
and delivers local mail locally. Our users use IMAP with thunderbird.
So, this machine handles all mail for mydomain.com and a few
virtual domains.

I have another box called rt.mydomain.com which is running sendmail. It
has a local user alias called rt, which gets piped to a program.

I need users to be able to send email to rt@mydomain.com and have it
forwarded to rt@rt.mydomain.com for processing.
I have tried simply creating an alias with the web interface such that
rt gets emailed to rt@rt.mydomain.com but thunderbird
says that the username doesn't exist (550 error) and wont send the
email. So, do I need to configure relaying to rt.mydomain.com somehow?

Thanks in advance.


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