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<h2><a href="mailfront.html">MailFront</a></h2>
<h1>POP3 Front End</h1>
<hr>
<p>The POP3 front end is composed of two pieces: an authentication
front end and a transfer back-end.</p>
<p>Connections are timed out after <tt>$TIMEOUT</tt> seconds of
inactivity (defaults to 1200 seconds or 20 minutes), or
<tt>$SESSION_TIMEOUT</tt> seconds after the connection was established
(defaults to 86400 seconds or 24 hours).</p>
<h2>pop3front-auth</h2>
<p>Usage: <tt>pop3front-auth CVM PROGRAM [ ARGS ... ]</tt></p>
<p><tt>pop3front-auth</tt> authenticates the username and password sent
by the client using the named CVM. If successful, it sets up the
environment and executes <tt>PROGRAM</tt>. It also offers <a
href="http://www.faqs.org/rfcs/rfc1734.html">RFC 1734</a> complient AUTH
support through <a href="cvm-sasl.html">cvm-sasl</a>.</p>
<p>If <tt>$AUTH_TIMEOUT</tt> or <tt>$AUTH_SESSION_TIMEOUT</tt> are set,
they override <tt>$TIMEOUT</tt> and <tt>$SESSION_TIMEOUT</tt>
respectively.</p>
<p>If <tt>$MAXUSERCMD</tt> is set, no more than the specified number of
the <tt>USER</tt> command may be issued. If <tt>$MAXAUTHFAIL</tt> is
set, no more than the specified number of authentication failures may
occur. After these limits are reached, the client is disconnected.</p>
<h2>pop3front-maildir</h2>
<p>Usage: <tt>pop3front-maildir [ DEFAULT-MAILDIR ]</tt></p>
<p><tt>pop3front-maildir</tt> serves messages via POP3 out of a
maildir. If <tt>$MAILBOX</tt> is set, its contents are used as the
path to the mailbox, otherwise the <tt>DEFAULT-MAILDIR</tt> argument
must be present. If <tt>$MAX_MESSAGES</tt> is set, the total number
of accessable messages will be limited to that number. In addition,
if either of <tt>$MAX_CUR_MESSAGES</tt> or <tt>$MAX_NEW_MESSAGES</tt>
are set, the total number of accessable messages in the <tt>cur</tt>
and <tt>new</tt> subdirectories respectively will each be limited to
that number.</p>
<p>If the filenames in the maildir contain a size indicator, as
specified <a href="http://www.courier-mta.org/imap/README.maildirquota.html">here
for Courier IMAP</a>
and <a href="http://wiki.dovecot.org/MailboxFormat/Maildir">here for
Dovecot</a>, this program will avoid using stat to calculate the file
size. This is a significant performance optimization on systems with
either very large or very many mailboxes.</p>
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