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	<title>PostfixMail.com &#187; Postfix Training</title>
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	<description>Postfix Mail Server Training and Consulting</description>
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		<title>Build Postfix From Source on CentOS</title>
		<link>http://postfixmail.com/blog/index.php/build-postfix-from-source-on-centos/</link>
		<comments>http://postfixmail.com/blog/index.php/build-postfix-from-source-on-centos/#comments</comments>
		<pubDate>Sat, 26 Sep 2009 12:39:04 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Compile Postfix]]></category>
		<category><![CDATA[postfix]]></category>
		<category><![CDATA[Postfix Training]]></category>
		<category><![CDATA[source postfix]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=806</guid>
		<description><![CDATA[Build Postfix From Source on CentOSBuilding Postfix from source can be a rewarding experience with great results.  This tutorial will show you how to do a basic build and then following tutorials will show you how to build in additional features. Download Source Code From Here: http://www.postfix.org/download.html When you download the source and unpack it [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<title>tcp_wrappers Problems</title>
		<link>http://postfixmail.com/blog/index.php/tcp_wrappers-problems/</link>
		<comments>http://postfixmail.com/blog/index.php/tcp_wrappers-problems/#comments</comments>
		<pubDate>Thu, 04 Dec 2008 12:28:15 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Troubleshooting]]></category>
		<category><![CDATA[Postfix Mail Server]]></category>
		<category><![CDATA[Postfix Training]]></category>
		<category><![CDATA[tcp_wrappers]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=326</guid>
		<description><![CDATA[Mail Does Not Send A common problem is finding that mail is not sending correctly and that the /var/spool/clientqueue is filling up with files. This directory can actually shut down your server if you do not have a separate directory for /var when this happen. The speed at which this happens is determined by the [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<title>Monitoring Postfix with Nagios 3</title>
		<link>http://postfixmail.com/blog/index.php/monitoring-postfix-with-nagios-3/</link>
		<comments>http://postfixmail.com/blog/index.php/monitoring-postfix-with-nagios-3/#comments</comments>
		<pubDate>Fri, 28 Nov 2008 10:43:05 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Security]]></category>
		<category><![CDATA[monitor postfix]]></category>
		<category><![CDATA[nagios monitoring]]></category>
		<category><![CDATA[postfix]]></category>
		<category><![CDATA[Postfix Training]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=319</guid>
		<description><![CDATA[When you set up Postfix it is a critical service for your organization.  It is important that you set up a way to verify that the mail server is up and running.  Nagios 3 provides an easy set up to allow you to monitor your mail server.  This tutorial  will help you understand how to [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Header Checks: Examples of What Not to Do</title>
		<link>http://postfixmail.com/blog/index.php/header-checks-examples-of-what-not-to-do/</link>
		<comments>http://postfixmail.com/blog/index.php/header-checks-examples-of-what-not-to-do/#comments</comments>
		<pubDate>Mon, 17 Nov 2008 12:26:22 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Filters]]></category>
		<category><![CDATA[header checks]]></category>
		<category><![CDATA[postfix]]></category>
		<category><![CDATA[postfix spam]]></category>
		<category><![CDATA[Postfix Training]]></category>
		<category><![CDATA[spam]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=305</guid>
		<description><![CDATA[Listed here are a number of header checks that do work but they are ineffective for the most part.  Here is the problem.  When you look at these examples they have a Subject that you are searching for.  As a result you will be writing header checks until the day you die, not good.    My [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<title>Automating Log Statistics</title>
		<link>http://postfixmail.com/blog/index.php/automating-log-statistics/</link>
		<comments>http://postfixmail.com/blog/index.php/automating-log-statistics/#comments</comments>
		<pubDate>Thu, 13 Nov 2008 14:52:56 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Statistics]]></category>
		<category><![CDATA[postfix]]></category>
		<category><![CDATA[Postfix statistics]]></category>
		<category><![CDATA[Postfix Training]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=295</guid>
		<description><![CDATA[This tutorial will show you how to set up your log statistics to be mailed to you every night so you know what is happening with your Postfix Mail Server. Set up a cron job so that it will run at 11:55 PM, just before midnight as you want to get all of the logs [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
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		<title>Built in Content Filters for Postfix</title>
		<link>http://postfixmail.com/blog/index.php/built-in-content-filters-for-postfix/</link>
		<comments>http://postfixmail.com/blog/index.php/built-in-content-filters-for-postfix/#comments</comments>
		<pubDate>Sat, 08 Nov 2008 15:18:51 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Filters]]></category>
		<category><![CDATA[header checks]]></category>
		<category><![CDATA[postfix header]]></category>
		<category><![CDATA[Postfix Training]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=293</guid>
		<description><![CDATA[One way to implement content filtering is to use regular expressions in your header, mime_header, nested_header and  body checks.  This should be simple matches to regular expressions.  The goal with this example is to eliminate non-English characters, since we cannot read them anyway.  This will drop all non-English mail. header_checks = pcre:/etc/postfix/header_checks mime_header_checks = pcre:/etc/postfix/mime_header_checks [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Blocking Country Attacks</title>
		<link>http://postfixmail.com/blog/index.php/blocking-country-attacks/</link>
		<comments>http://postfixmail.com/blog/index.php/blocking-country-attacks/#comments</comments>
		<pubDate>Fri, 07 Nov 2008 10:11:36 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Security]]></category>
		<category><![CDATA[postfix firewall]]></category>
		<category><![CDATA[postfix security]]></category>
		<category><![CDATA[Postfix Training]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=288</guid>
		<description><![CDATA[I recently checked mail stats on a server and discovered that 71% of the mail that the server handled was rejected. That means the server lost 71% of it&#8217;s total resources to connections that were either malicious in nature or intended to solicit resources from individuals.  As a result I have gone into a campaign [...]]]></description>
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		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>Create Users in Cyrus-IMAP</title>
		<link>http://postfixmail.com/blog/index.php/create-users-in-cyrus-imap/</link>
		<comments>http://postfixmail.com/blog/index.php/create-users-in-cyrus-imap/#comments</comments>
		<pubDate>Sat, 01 Nov 2008 23:37:10 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Cyrus-Imap]]></category>
		<category><![CDATA[cyrus-imap users]]></category>
		<category><![CDATA[postfix]]></category>
		<category><![CDATA[Postfix Mail Server]]></category>
		<category><![CDATA[Postfix Training]]></category>
		<category><![CDATA[yrus users]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=279</guid>
		<description><![CDATA[Create Users Create the users on the system. Create users with the false option so they cannot log into the server. This is an added security feature. A. Create the User useradd sue -s /bin/false passwd sue A common mistake is to forget to provide passwords for these users. B. Use saslpasswd2 to create a [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Postfix: Cannot Receive Mail</title>
		<link>http://postfixmail.com/blog/index.php/postfix-cannot-receive-mail/</link>
		<comments>http://postfixmail.com/blog/index.php/postfix-cannot-receive-mail/#comments</comments>
		<pubDate>Thu, 18 Sep 2008 12:15:18 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Troubleshooting]]></category>
		<category><![CDATA[Postfix Mail Server Trainging]]></category>
		<category><![CDATA[Postfix Training]]></category>
		<category><![CDATA[Postfix troubleshooting]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=147</guid>
		<description><![CDATA[Problem: Cannot Receive Mail In this example the user can send mail and it all works correctly but the user is not able to receive any mail. However, viewing the /var/log/ Sep 17 13:25:50 ns postfix/smtpd[17971]: &#62; rn-out-0910.google.com[64.233.170.190]: 250 2.0.0 Ok: queued as 4A454207D8D Sep 17 13:25:50 ns postfix/virtual[17976]: 4A454207D8D: to=&#60;tsmith@example.com&#62;, relay=virtual, delay=1.8, delays=1.8/0/0/0.01, dsn=4.2.0, [...]]]></description>
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		<slash:comments>0</slash:comments>
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