LinuxQuestions.org - Qn: How to restrict in/out emails within a domain name/internal organisation only?

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Qn: How to restrict in/out emails within a domain name/internal organisation only?

Hi,

I have searched high and low for a solution to my problem but couldn't not find any. Really need help on this one.

I have a server that runs RedHat Linux 9.0. For one of the domain names, I wish to restrict email communications within that domain name only. That is, tom@domain.com could only send/receive to/from jenny@domain.com and vice-versa. If you like, I am trying to implement a closed email system for communication within an internal organisation only.

Does anyone know how to achieve this?

Many thanks in advance.

R

As you fail to tell what daemon you're using, and as I'm not used to work with RH, I can only
tell you that you might want to have a look at relaying (or at least preventing it).

btw: as you're posting in a security forum, I really feel I must say that RH9 is not
really secure anymore. Support stopped in April, it's August now; time to upgrade don't you think?