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	<title>PostfixMail.com &#187; Spam Control</title>
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	<link>http://postfixmail.com/blog</link>
	<description>Postfix Mail Server Training and Consulting</description>
	<lastBuildDate>Sat, 10 Jul 2010 13:18:43 +0000</lastBuildDate>
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		<title>Spamassassin Blacklists</title>
		<link>http://postfixmail.com/blog/index.php/spamassassin-blacklists/</link>
		<comments>http://postfixmail.com/blog/index.php/spamassassin-blacklists/#comments</comments>
		<pubDate>Mon, 04 Jan 2010 17:12:23 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Spam Control]]></category>
		<category><![CDATA[blacklists]]></category>
		<category><![CDATA[spamassasin]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=898</guid>
		<description><![CDATA[Spamassassin BlacklistsBlacklists are a little easier to understand in that you will find domains or senders that you simply do not want to receive mail from them ever. There are two blacklist directives.  The first directive, blacklist_from will specify a a sender address that address is what will appear in the Resent-From, From, Envelope-Sender, Resent-Sender [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<item>
		<title>Spamassassin Whitelists</title>
		<link>http://postfixmail.com/blog/index.php/spamassassin-whitelists/</link>
		<comments>http://postfixmail.com/blog/index.php/spamassassin-whitelists/#comments</comments>
		<pubDate>Wed, 30 Dec 2009 15:05:35 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Spam Control]]></category>
		<category><![CDATA[spamassassin]]></category>
		<category><![CDATA[whitelists]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=892</guid>
		<description><![CDATA[Spamassassin WhitelistsGlobal Manual Whitelist Once you have set up Spamassassin so it is working and you have run it for some time you may want to tune it to provide automatic whitelists and blacklists.  The whitelist will provide a way to insure that the mail from a particular source will never get rejected.  This may [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Postfix: Bayesian Learning System</title>
		<link>http://postfixmail.com/blog/index.php/postfix-bayesian-learning-system/</link>
		<comments>http://postfixmail.com/blog/index.php/postfix-bayesian-learning-system/#comments</comments>
		<pubDate>Sun, 22 Nov 2009 12:42:26 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Spam Control]]></category>
		<category><![CDATA[Bayesian Filtering]]></category>
		<category><![CDATA[postfix]]></category>
		<category><![CDATA[Postfix Spam Filtering]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=661</guid>
		<description><![CDATA[Postfix: Bayesian Learning SystemLearning System You are able to additionally tune SpamAssassin to learn about your email.  Two programs are used together to create this learning system; autowhitelisting and Bayesian filtering.  Autowhitelisting is an algorithm that learns about each senders history and modifies the spam score of their subsequent mail.  This should reduce false positives.  [...]]]></description>
		<wfw:commentRss>http://postfixmail.com/blog/index.php/postfix-bayesian-learning-system/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Using Amavisd and Spamassassin to Block Spam</title>
		<link>http://postfixmail.com/blog/index.php/using-amavisd-and-spamassassin-to-block-spam/</link>
		<comments>http://postfixmail.com/blog/index.php/using-amavisd-and-spamassassin-to-block-spam/#comments</comments>
		<pubDate>Sat, 15 Aug 2009 13:32:42 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Spam Control]]></category>
		<category><![CDATA[amavisd]]></category>
		<category><![CDATA[postfix]]></category>
		<category><![CDATA[spam]]></category>
		<category><![CDATA[spamassassin]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=672</guid>
		<description><![CDATA[There will be times when you have you have your Postfix Mail Server set up and Spam is under control and all of a sudden you will see a new wave of Spam hit your site.  This article will help you see how you can make some small adjustments to cut down on new waves [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Postfix: Whitelists and Blacklists</title>
		<link>http://postfixmail.com/blog/index.php/postfix-whitelists-and-blacklists/</link>
		<comments>http://postfixmail.com/blog/index.php/postfix-whitelists-and-blacklists/#comments</comments>
		<pubDate>Mon, 11 May 2009 13:47:41 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Spam Control]]></category>
		<category><![CDATA[Uncategorized]]></category>
		<category><![CDATA[postfix]]></category>
		<category><![CDATA[Postfix Blacklist]]></category>
		<category><![CDATA[Postfix Mail Server]]></category>
		<category><![CDATA[Postfix whitelist]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=654</guid>
		<description><![CDATA[Whitelists / Blacklists You can set up whitelists and blacklists to modify the settings to make sure certain email addresses never get blocked or always get blocked. Prevent any Spam Checking In order to create a situation where you have no Spam checking you can use the bypass option.  These options are added to amavisd.conf [...]]]></description>
		<wfw:commentRss>http://postfixmail.com/blog/index.php/postfix-whitelists-and-blacklists/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Quarantine Spam with Amavisd</title>
		<link>http://postfixmail.com/blog/index.php/amavisd-new-spam-handling/</link>
		<comments>http://postfixmail.com/blog/index.php/amavisd-new-spam-handling/#comments</comments>
		<pubDate>Thu, 19 Mar 2009 13:11:49 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Spam Control]]></category>
		<category><![CDATA[amavisd]]></category>
		<category><![CDATA[amavisd-new]]></category>
		<category><![CDATA[spam]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=449</guid>
		<description><![CDATA[Amavisd-new acts as a connecting point between Spamassassin, Clamav and Postfix.  This is important to  remember because much of the configuration that would seem to be done on Spamassasin directly, actually occurs in the amavisd-new configuration file. When amavisd detects spam using Spamassassin it will log it to the log file and it also is [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Blackholes for Spam &#8211; Finding a Balance</title>
		<link>http://postfixmail.com/blog/index.php/blackholes-for-spam-finding-a-balance/</link>
		<comments>http://postfixmail.com/blog/index.php/blackholes-for-spam-finding-a-balance/#comments</comments>
		<pubDate>Mon, 26 Jan 2009 11:34:41 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Spam Control]]></category>
		<category><![CDATA[blackholes]]></category>
		<category><![CDATA[RBLs]]></category>
		<category><![CDATA[spam]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=387</guid>
		<description><![CDATA[Having tried a number of RBLs you will see that some are going out of existence, some are either too aggressive or just do not cover all of the areas that give you the protection you need.  Here is a list that makes a good combination of protection without getting too crazy.  Be sure to [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Dropping Spanish Spam with Spamassassin</title>
		<link>http://postfixmail.com/blog/index.php/dropping-spanish-spam-with-spamassassin/</link>
		<comments>http://postfixmail.com/blog/index.php/dropping-spanish-spam-with-spamassassin/#comments</comments>
		<pubDate>Fri, 05 Dec 2008 12:52:19 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Spam Control]]></category>
		<category><![CDATA[spamassasin]]></category>
		<category><![CDATA[spamassassin rules]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=328</guid>
		<description><![CDATA[Spamassassin has a section in /usr/share/spamassassin called 25_body_tests_es.cf which deals with Spanish Spam.  These rules are not listed in the 50_scores.cf so as explained in the 50_scores.cf rules not listed automatically get a score of “1”.  In some cases that score may not be enough so you will want to modify it in /etc/mail/spamassassin/local.cf.  In [...]]]></description>
		<wfw:commentRss>http://postfixmail.com/blog/index.php/dropping-spanish-spam-with-spamassassin/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>SpamAssassin Rules Basics</title>
		<link>http://postfixmail.com/blog/index.php/spamassassin-rules-basics/</link>
		<comments>http://postfixmail.com/blog/index.php/spamassassin-rules-basics/#comments</comments>
		<pubDate>Mon, 24 Nov 2008 12:20:23 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Spam Control]]></category>
		<category><![CDATA[postfix]]></category>
		<category><![CDATA[spamassassin]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=317</guid>
		<description><![CDATA[SpamAssassin will use tests to check mail headers, the body, IP Addresses and checksums to locate patterns that indicate SPAM.  So SpamAssassin will use pattern-based scores for checking patters that are found in headers, the body or attachments and it will use network-based tests that use DNS lookups or access RBL lists. If you look [...]]]></description>
		<wfw:commentRss>http://postfixmail.com/blog/index.php/spamassassin-rules-basics/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>Stopping Non-English Spam</title>
		<link>http://postfixmail.com/blog/index.php/stopping-non-english-spam/</link>
		<comments>http://postfixmail.com/blog/index.php/stopping-non-english-spam/#comments</comments>
		<pubDate>Sat, 22 Nov 2008 12:38:53 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Spam Control]]></category>
		<category><![CDATA[non-english spam]]></category>
		<category><![CDATA[postfix]]></category>
		<category><![CDATA[spam]]></category>
		<category><![CDATA[spamassassin]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=313</guid>
		<description><![CDATA[One way you may choose to manage the mail that comes to the Postfix server is to use the locales which is a part of Spamassassin.  If you cannot read other languages there is really no need to run them through your mail system.  So for example if you wanted to limit email to English [...]]]></description>
		<wfw:commentRss>http://postfixmail.com/blog/index.php/stopping-non-english-spam/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Postfix Spam Control &#8211; Address Verification</title>
		<link>http://postfixmail.com/blog/index.php/postfix-spam-control-address-verification/</link>
		<comments>http://postfixmail.com/blog/index.php/postfix-spam-control-address-verification/#comments</comments>
		<pubDate>Sun, 14 Sep 2008 17:48:56 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Spam Control]]></category>
		<category><![CDATA[postfix]]></category>
		<category><![CDATA[Postfix Address Verification]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=99</guid>
		<description><![CDATA[Address Sender Verification One of the best methods of restricting SPAM is to require address verification. This means that Postfix will initiate a SMTP session with the client&#8217;s server to verify that it is a legitimate address. This takes time and resources but&#8230;it a very effective way to deal with SPAM. You will need to [...]]]></description>
		<wfw:commentRss>http://postfixmail.com/blog/index.php/postfix-spam-control-address-verification/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Postfix Spam Control &#8211; Blackholes</title>
		<link>http://postfixmail.com/blog/index.php/postfix-spam-control-blackholes/</link>
		<comments>http://postfixmail.com/blog/index.php/postfix-spam-control-blackholes/#comments</comments>
		<pubDate>Sun, 14 Sep 2008 16:37:00 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Spam Control]]></category>
		<category><![CDATA[Mail Blackholes]]></category>
		<category><![CDATA[Postfix Spam Control]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=91</guid>
		<description><![CDATA[Using a Blackhole The one thing that is important to understand when using blackholes is that these DNS blacklists require Postfix to do a DNS lookup which will take resources from your server and create latency. However, this can be a significant reduction in SPAM. In the example below two kinds of lists are used [...]]]></description>
		<wfw:commentRss>http://postfixmail.com/blog/index.php/postfix-spam-control-blackholes/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>Postfix Spam Control &#8211; Networks</title>
		<link>http://postfixmail.com/blog/index.php/postfix-spam-control-networks/</link>
		<comments>http://postfixmail.com/blog/index.php/postfix-spam-control-networks/#comments</comments>
		<pubDate>Sun, 14 Sep 2008 16:33:17 +0000</pubDate>
		<dc:creator>mike</dc:creator>
				<category><![CDATA[Spam Control]]></category>
		<category><![CDATA[Non-routable Networks]]></category>
		<category><![CDATA[Posfix Spam Control]]></category>

		<guid isPermaLink="false">http://postfixmail.com/blog/?p=87</guid>
		<description><![CDATA[Non-Routable Networks Spammers will also use networks which are not routeable, thus not traceable. You can stop this technique with Postfix, however, your network firewall should not allow these kinds of networks to enter your network at all. Step #1: Create bogus_mx Create a map that will list these unrouteable networks. Place one network on [...]]]></description>
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		<slash:comments>0</slash:comments>
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