SMTP Configuration

Hello,

I am setting up a new Mail Server. I want to Use POP3/SMTP Settings for my Server:-

I want to allow my Clients to use my mail server to as SMTP Mail Server because most of them are mobile user not sitting in one place.

I have added the IPs of My few remote offices in

“Allow messages only from the following internet hosts to be sent to external internet domains:”

All the Clients behined the specified IPs can use SMTP as server. but users out side my office canot do that.

If I remove the Relay restriction My Mail Server is Open to ALL.

How to achive the goal?

Thanks.

-Sajid