Hopefully this is the right spot for this. I'm using centOS and Atmail for my mail server. What I would like to do is to route mail through the mail server for external accounts. I'll try to explain what I mean.
Lets say that
jon@abc.com is an account "attached" to the atmail server (internal mail only) and
bill@roadrunner.com is obviously from a "outside" account. What I would like is to route the mail for
bill@roadrunner.com through the atmail server so he can send jon a email. The setting in outlook for example would be something along the lines of:
popserver: the roadrunner address
smtp: atmail ip address
As of now Jon can send Bill email but Bill can't respond since abc.com isn't being directed to the atmail server from the outside world.
Before I forget, if I change the smtp server to the atmail account for Bill he can email Jon but not anyone on the outside, even though Jon can email Bill and people on the outside.
Am I being clear enough? I know reading it, it seems kinda convoluted.