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I am planning to install Linux Email Server. I have Domain Registered, Now the Email Server which i am going to setup should be accessible to my other users in our branch office located in another country.
Yes acid_kewpie just to put it simple i used the term "Email Server". I decided to use postfix as MTA. Infact once i installed and tested it in Local Environment. Now my doubt is how this can be made accessible to my collegues in other countries as i am planning to create their users in my computer.
As long as you are able to access port 25 on your network from outside your LAN, they should be fine. Add them as regular users (or any one of the alternatives, but for simplicity, we'll assume regular users) and, if necessary, create the Maildir inside their home directories. If you chose not to use Maildir's, then there is no need to create anything, postfix will work it's own magic.
After adding users, reload postfix. If you are going to use aliases, run postalias after, or simply reload postfix.