[CentOS] Me llega mucho spammmmm
Mark Weaver
mdw1982 at mdw1982.comTue Aug 21 01:23:31 UTC 2007
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Noel Sanchez wrote: >> Que te pasa con sendmail >> ___________________________________ If you haven't already, take a look at ORDB lookups done with Sendmail. This should be the first level of a multi-layer anti-spam approach for any Sendmail installation. Custom Rolled IP Tables Firewall Ruleset (Firewall - Layer 1) - Use Geo-blocking: deliberately blocking port 25 traffic, at the very least, entire netblocks where SPAM is known to originate from. (email me off-list and I can send you a collection of bash and perl scripts I use to both create rulesets and refresh the IP tables rules being used in my Firewall running on my mailserver.) Sendmail (MTA Level - layer 2) - configure sendmail to cause it to do ORDB lookups from any one of many very dependable ORDB's such as SpamCop to check to see if the IP listed in the headers exists in the ORDB database. SpamAssassin (MTA Level - Layer 2) - Setup SpamAssassin, configure it and start using this critter; not as a first and only line of defense, but as part of a layered approach to controlling the amount of SPAM reaching your network and users. Administrator Diligence (Application Level - Layer 3) You're never going to stop it all - the best you can hope for is to reach a state of equilibrium. Once you reach that state you should only see a spike now and then, but expect at least 5-7 SPAM per user per week. Diligence in keeping the filters updated is Key. -- Mark "If you have found a very wise man, then you've found a man that at one time was an idiot and lived long enough to learn from his own stupidity." ============================================== Powered by CentOS4 (RHEL4)
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