Do I need special setup (w/Slackware64 15, 15+current) to enable email to be sent & received by any computer on a LAN, like does there need to be LAN DNS/bind server?
        Sometimes it's just better to send & receive mail like user@pc1 to/from user@pc2 instead of going out through large commercial or even local ISP email servers. I did it in the past but maybe you don't even need special setup as long as every computer has an up-to-date /etc/hosts?
        What about sending & receiving email such user@pc.example.com? (not really using example.com) Is there a way to forward from my LAN's server.example.com (postfix, dovecot) to pc's mailspool instead of POP3/IMAP? (maybe I'd have to use fetchmail again?)
        If I wanted to receive mail and not be suspected spam I guess I'd have to add pc.example.com DNS entry... though as for spam, our ISP won't let us have/make PTR records (even with business account) which reduce detection as spam.

I think what I did here is to make rc.postfix executable and there is an iptables rule
opening port 25 tcp in all LAN machines.
This setup is very old so I don't remember if there is something else to do.

To test it 'echo mail test $(date)|mail user@host'
works with or without domain 'user@host.domain'

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