I am setting up to use a service from an external company that utilizes SMTP for messaging via a non-standard port. So to be clear - this is *not* for standard mail!

Given a recipient address in the form "s123...@example.com", and I'm given the IP and port, do I just need to define an entry in my transport map? E.g.:

s123...@example.com     1.2.3.4:5525

Do I need to define anything for relay_domains or anything else?


Separate question - since my own server is *not* an open relay and only permits authorized users, how do I allow that external address to either be used as the sender (which I'd rather not) or re-write my authorized sender for the relay?

--
Daniel

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