From: Andrew L. on
running postfix-2.3.3-2 on CentOS 5, I am looking to have this host
receive mail for local users FROM all machines on the same subnet
(domain = escapewire.local) 192.168.10.x..

I had this working but now I am getting relay denied errors and am
unsure where I goofed. Note: some of the local machines may send mail
with FROM = escapewire.com as they have that tld in their hostname.
Below is the output of postconf -n, please let me know if more info is
needed.

Aside: I am also looking for a good "current" howto on setting up
postfix with encryption, imap, pop, and virtual users. I am open to
whatever packages are suggested, ie dovecot, etc... There will only be
about 30 vusers max, so I don't think(?) a db backend is needed.

--- postconf -n ---
alias_database = hash:/etc/postfix/aliases alias_maps =
hash:/etc/postfix/aliases command_directory = /usr/sbin
config_directory = /etc/postfix daemon_directory =
/usr/libexec/postfix debug_peer_level = 2 html_directory =
/usr/share/doc/postfix-2.4.5-documentation/html
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
myhostname = authorization.escapewire.com mynetworks =
192.168.10.0/28, 127.0.0.0/8 newaliases_path =
/usr/bin/newaliases.postfix readme_directory =
/usr/share/doc/postfix-2.4.5-documentation/readme
relay_domains = $mydestination
sample_directory = /etc/postfix
sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop
unknown_local_recipient_reject_code = 550
---

Regards,
Andrew