Restrict Incoming Mail

[Brendan Chard]

This is more of a post installation, big picture question but hopefully some
of you have done this.

I now have a FreeBSD box up and running with MS that is serving as a mail
relay for 4 other FreeBSD boxes that actually have the user accounts on
them.

How can I restrict the FreeBSD boxes behind the mail relay server to only
accept incoming mail from the MS relay server and localhost?  Can this be
done while still allowing the users to send mail out through the FreeBSD
boxes that they log into?

Thanks,
-Brendan
brendan at chard.net

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