78 lines
5.6 KiB
HTML
78 lines
5.6 KiB
HTML
|
<?xml version="1.0" encoding="UTF-8"?>
|
||
|
|
<!DOCTYPE html
|
||
|
|
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
||
|
|
<html lang="en-us" xml:lang="en-us">
|
||
|
|
<head>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
||
|
|
<meta name="security" content="public" />
|
||
|
|
<meta name="Robots" content="index,follow" />
|
||
|
|
<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
|
||
|
|
<meta name="DC.Type" content="task" />
|
||
|
|
<meta name="DC.Title" content="Accept relay messages from Post Office Protocol clients" />
|
||
|
|
<meta name="abstract" content="One of the options for relay restriction enables Post Office Protocol (POP) clients to relay messages through Simple Mail Transfer Protocol (SMTP) for a specified period of time after they log on to the POP server." />
|
||
|
|
<meta name="description" content="One of the options for relay restriction enables Post Office Protocol (POP) clients to relay messages through Simple Mail Transfer Protocol (SMTP) for a specified period of time after they log on to the POP server." />
|
||
|
|
<meta name="DC.Relation" scheme="URI" content="rzairneardomain.htm" />
|
||
|
|
<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
|
||
|
|
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2004, 2006" />
|
||
|
|
<meta name="DC.Format" content="XHTML" />
|
||
|
|
<meta name="DC.Identifier" content="rzairpopbeforesmtp" />
|
||
|
|
<meta name="DC.Language" content="en-us" />
|
||
|
|
<!-- All rights reserved. Licensed Materials Property of IBM -->
|
||
|
|
<!-- US Government Users Restricted Rights -->
|
||
|
|
<!-- Use, duplication or disclosure restricted by -->
|
||
|
|
<!-- GSA ADP Schedule Contract with IBM Corp. -->
|
||
|
|
<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
|
||
|
|
<link rel="stylesheet" type="text/css" href="./ic.css" />
|
||
|
|
<title>Accept relay messages from Post Office Protocol clients</title>
|
||
|
|
</head>
|
||
|
|
<body id="rzairpopbeforesmtp"><a name="rzairpopbeforesmtp"><!-- --></a>
|
||
|
|
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
|
||
|
|
<h1 class="topictitle1">Accept relay messages from Post Office Protocol clients</h1>
|
||
|
|
<div><p>One of the options for relay restriction enables Post Office Protocol
|
||
|
|
(POP) clients to relay messages through Simple Mail Transfer Protocol (SMTP)
|
||
|
|
for a specified period of time after they log on to the POP server.</p>
|
||
|
|
<div class="section"><p>This function is commonly called POP before SMTP. It is particularly
|
||
|
|
useful for mobile employees that use dynamic IP addresses, because security
|
||
|
|
checking functions that use fixed IP addresses are not effective for checking
|
||
|
|
dynamic IP addresses. You can enable a mobile employee to authenticate once
|
||
|
|
to the POP server and to send e-mail for a designated period of time (15 -
|
||
|
|
65535 minutes) without authenticating again.</p>
|
||
|
|
<p>For example, you might
|
||
|
|
configure the server to allow your remote users to relay messages through
|
||
|
|
the SMTP server during a four-hour (240-minutes) period of time after they
|
||
|
|
log on to the POP server. In this example, a mobile worker logs on to the
|
||
|
|
POP server to retrieve his e-mail. The POP server records the user's IP address
|
||
|
|
and a time stamp in a queue. An hour later, the user decides to send an e-mail
|
||
|
|
message. When he sends the e-mail message using SMTP, the SMTP server checks
|
||
|
|
the queue to verify that the user accessed the POP server to retrieve e-mail
|
||
|
|
sometime during the configured time period. After the user is verified, the
|
||
|
|
SMTP server relays the e-mail message to the SMTP client for delivery to the
|
||
|
|
e-mail recipient.</p>
|
||
|
|
<div class="note"><span class="notetitle">Note:</span> To more precisely control the users that can access
|
||
|
|
your e-mail server, you can use the relay restriction function and the connection
|
||
|
|
restriction function together. For example, you might want to restrict specific
|
||
|
|
groups of users from connecting to your e-mail server but allow certain POP
|
||
|
|
clients within that group to use your SMTP server to send e-mail messages.</div>
|
||
|
|
<p>To
|
||
|
|
enable POP clients to relay messages for a specified length of time, follow
|
||
|
|
these steps:</p>
|
||
|
|
</div>
|
||
|
|
<ol><li><span>In iSeries™ Navigator,
|
||
|
|
expand <span class="menucascade"><span class="uicontrol">your iSeries Server</span> > <span class="uicontrol">Network</span> > <span class="uicontrol">Servers</span> > <span class="uicontrol">TCP/IP</span></span>.</span></li>
|
||
|
|
<li><span>Right-click <span class="uicontrol">SMTP</span> and select <span class="uicontrol">Properties</span>.</span></li>
|
||
|
|
<li><span>Click the <span class="uicontrol">Relay Restrictions</span> tab.</span></li>
|
||
|
|
<li><span>For <span class="uicontrol">Allow relay messages</span>, select <span class="uicontrol">Specified</span>.</span></li>
|
||
|
|
<li><span>Select <span class="uicontrol">From the POP client for the following duration
|
||
|
|
(15 - 655535)</span> and enter a time value to specify the number of
|
||
|
|
minutes to allow a client to send mail using the SMTP server.</span></li>
|
||
|
|
<li><span>Click <span class="uicontrol">Help</span> for more information.</span></li>
|
||
|
|
<li><span>Click <span class="uicontrol">OK</span>.</span></li>
|
||
|
|
</ol>
|
||
|
|
</div>
|
||
|
|
<div>
|
||
|
|
<div class="familylinks">
|
||
|
|
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzairneardomain.htm" title="A common concern that you might face is protecting your server from people who try to use your e-mail server for spamming, or sending large amounts of bulk e-mail. To avoid these problems, use the relay restriction function to specify as closely as possible who can use your server for relay.">Restrict relays</a></div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</body>
|
||
|
|
</html>
|