12-11-2009
Actually, while Postfix has many configuration files and can be endlessly configurated, getting a basic Postix MTA (Mail Transport Agent) running is quite easy.
Here is the relevant section of the RHEL 5.4 Deployment Guide which discusses how to setup Postix.
RHEL 5.4 Deployment Guide Section 24.3.2
As well as an MTA, you need an MAA (Mail Access Agent) like Dovecot which handles protocols like IMAP, IMAPS, POP3 and POP3S, and an MUA (Mail User Agent) like Evolution.
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LEARN ABOUT DEBIAN
maildirkw
MAILDIRKW(1) Double Precision, Inc. MAILDIRKW(1)
NAME
maildirkw - set maildir message keywords
SYNOPSIS
maildirkw [-c] [-l] [-a] [-r] {maildir} {message} [keyword...]
maildirkw [-c] {-L} {maildir}
DESCRIPTION
maildirkw modifies the Courier IMAP server compatible maildir message keywords. This command allows an easy way to set or clear custom IMAP
keywords associated with a particular message. maildir is the pathname to a maildir, or a maildir folder. The -L option lists all messages
in the maildir, and their associated keywords. message specified which message's keywords should be set. One or more keywords specifies a
list of keywords to be set for this message. The specified list of keywords replaces any keywords presently set for the message, unless the
-a or the -r option is specified.
The -a option adds the keyword to existing keywords that are set for message. The -r removes keywords from message, leaving any remaining
keywords set in place.
The -l should be used if the Courier IMAP server's configuration file has the IMAP_USELOCKS option set. -l enables a compatible locking
mechanism to update the message's keywords.
-c enables case-sensitive keywords. IMAP keywords are normally case insensitive. -c needs to be used if the SMAP1[1] protocol extension is
used, which uses case sensitive keywords.
SEE ALSO
maildiracl(1)[2], maildirmake(1)[3].
AUTHOR
Sam Varshavchik
Author
NOTES
1. SMAP1
http://www.courier-mta.org/cone/smap1.html
2. maildiracl(1)
[set $man.base.url.for.relative.links]/maildiracl.html
3. maildirmake(1)
[set $man.base.url.for.relative.links]/maildirmake.html
Courier Mail Server 08/31/2011 MAILDIRKW(1)