Doing Stuff with FreeBSD, OpenBSD, NetBSD and MacOSX
Postfix is an attempt to provide an alternative to the widely-used Sendmail program. Postfix attempts to be fast, easy to administer, and (hopefully) secure, while at the same time being sendmail-compatible enough to not upset your users.
If you run a groupware email server on your LAN like Microsoft Exchange, Lotus Notes, or similar, setting up a secure mail forwarder is a good alternative to opening port 25 from the Internet directly to your LAN server. Typically with these servers, you don’t want to put them on a DMZ segment for performance reasons, but you have to let in email from the Internet. Opening a port to these servers, and into your LAN, can be risky.
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