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This section will cover integrating <application>Amavisd-new</application>, <application>Spamassassin</application>, and <application>ClamAV</application> with the <application>Postfix</application> Mail Transport Agent (MTA). <application>Postfix</application> can also check email validity by passing it through external content filters. These filters can sometimes determine if a message is spam without needing to process it with more resource intensive applications. Two common filters are <application>opendkim</application> and <application>python-policyd-spf</application>.