58 lines
3.8 KiB
HTML
58 lines
3.8 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<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))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Control Simple Mail Transfer Protocol access" />
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<meta name="abstract" content="To prevent your server from being attacked by malicious or unsolicited mail (spam), you should control Simple Mail Transfer Protocol (SMTP) access." />
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<meta name="description" content="To prevent your server from being attacked by malicious or unsolicited mail (spam), you should control Simple Mail Transfer Protocol (SMTP) access." />
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<meta name="DC.Relation" scheme="URI" content="rzairplanseccontrol.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2004, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="controlsmtpaccess" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Control Simple Mail Transfer Protocol access</title>
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</head>
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<body id="controlsmtpaccess"><a name="controlsmtpaccess"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Control Simple Mail Transfer Protocol access</h1>
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<div><p>To prevent your server from being attacked by malicious or unsolicited
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mail (spam), you should control Simple Mail Transfer Protocol (SMTP) access.</p>
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<p>If you want to allow SMTP clients to access your iSeries™ server, you should protect your
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server from attack by performing the following tasks:</p>
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<ul><li>If possible, avoid using an *ANY *ANY entry in the system distribution
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directory. When your server does not have an *ANY *ANY entry, it is more difficult
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for someone to attempt to use SMTP to flood your server or overwhelm your
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network. Flooding occurs when your auxiliary storage is filled with unwanted
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mail that is being routed through your iSeries to another server.</li>
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<li>Set adequate threshold limits for your auxiliary storage pools (ASPs)
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to prevent a user from swamping your server with unwanted objects. You can
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display and set the thresholds for ASPs by using either system service tools
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(SST) or dedicated service tools (DST). Independent disk pools in the Backup
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and recovery topic provides more information about ASP thresholds. </li>
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<li>Tune the maximum number of prestart jobs that will be created by doing
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a CHGPJE. This will limit the number of jobs created during a denial of service
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attack. The default is 256 for the maximum threshold. </li>
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<li>Prevent outsiders from using your connection to send unsolicited e-mail
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(spam) by restricting relays and connections.</li>
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</ul>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzairplanseccontrol.htm" title="You should control who accesses your server through e-mail to protect your data from malicious attacks.">Control e-mail access</a></div>
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</div>
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</div>
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</body>
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</html>
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