September 16, 2009 SpamAssassin Way more than the Mac OS X Server GUI shows Presented by: Kevin A. McGrail Project Management Committee Member of the Apache.

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Presentation transcript:

September 16, 2009 SpamAssassin Way more than the Mac OS X Server GUI shows Presented by: Kevin A. McGrail Project Management Committee Member of the Apache Software Foundation SpamAssassin Project & President, PCCC

September 16, 2009 What is Spam? Spam is NOT about content, its about CONSENT. –Consent: to give assent or approval : agree Merriam-Webster Dictionary What is SPAM vs. spam?

Disagreements on Spam Hormel – SPAM Brand and the Internet CAN-SPAM! URIBLSucks September 16, 2009

What is Ham? In the anti-Spam community, Spam and Ham are opposites. –Spam = Junk s –Ham = Good s.

September 16, 2009 What is an FP? False-Positives (FPs) – s incorrectly tagged as Junk False-Negatives (FNs) – s incorrectly NOT tagged as Junk

September 16, 2009 Blacklist / Whitelist Blacklist = Bad Items Whitelist = Good Items Greylist = Undecided Items

September 16, 2009 What is SpamAssassin? SpamAssassin is a mail filter & API used to identify junk . SpamAssassin powers the Junk Mail Filtering tool in OS X. SpamAssassin is also the basis of several other commercial products.

September 16, 2009 SpamAssassin: Future-proof? SpamAssassin is a well-refined scoring framework Uses Rules-Based Heuristics Engine: Each Rule is given a Score –Lower, or Negative overall score = Ham –Higher overall score & equal to/above a threshold = Spam Utilizes a Genetic Algorithm on Ham & Spam collections to generate the weight for each rule Upcoming release separates Rules from Framework

September 16, 2009 Enabling the Junk Mail Filter

GUI Tweaks for the Junk Mail Filter September 16, 2009

SpamAssassin with Snow Leopard Snow Leopard (10.6.1) uses SA version was released June 11 th, 2007! was released June 12 th, 2008! is beyond 2 nd alpha with optimization for the score weighting in progress for imminent full release. September 16, 2009

Improve Your Mail Setup Improving your overall mail setup will assist other mail servers to identify legitimate senders: –rPTRs –Smart Host? MSA/MUA/MTA –SPF –Reduction of DSNs

Behind the OS X Server GUI Terminal Vi – the greatest editor ever invented. –Learn It, Love It, Buy the Coffee Cup. Xcode September 16, 2009

Tweaking your Installation Network Tests –Blacklists (BRBL, PSBL, SURBL, URIBL, ZEN) –Checksum Filters (DCC, Pyzor, Razor/Cloudmark) –Use a Caching Nameserver! Extra Rule Sets –KAM.cf

September 16, 2009 More Tweaking Consider your threshold for tagging Bayesian Classifier SpamTrainer.pre and.cf files

Future Tweaks? Domain Keys Identified Mail (DKIM) Author Domain Signing Practices (ADSP) sa-update September 16, 2009

More Spam Reduction Techniques? Using Blacklists to Outright Blocking –RBL to Greylisting

Common Problems Don’t whitelist your own domain! FPs with Mailing Lists / Newsletters / Digests September 16, 2009

Why is an Tagged / Not Tagged as Spam? Review the Headers –Content vs. Pathway Analysis Checking Blacklists September 16, 2009

Who is Sending the Spam? Who is sending the Spam? How did they get my address? Why do they send it? Creative Spam (to a Spam Junkie)

September 16, 2009 Making your Own Heuristic Rules 1 st Resource for Writing Rules (+ RegExes) Running “Lint” SpamAssassin Rules Emporium (SARE) Running tests manually Restart Mail Service to Implement Changes

September 16, 2009 Excuses, Excuses! Best Spam RBL Delisting Request –"Please delist us. We promote cosmic peace as in the poem below. This world badly needs it. Why do some hate peace and have us blacklisted?” Best Unsubscribe Tag –If you do not have Internet access, please send an to

September 16, 2009 Resources from this Speech –SpamAssassin – –SpamAssassin – Writing Rules - –Monty Python SPAM Skit – –Hormel SPAM and the Internet – –Xcode – –Sender Policy Framework – –The SpamHaus Project – –URIBL – –SURBL – –PCCC – Peregrine Computer Consultants Corporation – –KAM.cf – –SpamTrainer – –Genetic Algorithm – –Template thanks to

and Anti-Spam Dictionary Wikipedia, Google & the Web are invaluable tools for any administrator. In the notes for this slide are more definitions and their sources which may assist you in learning more to battle Spammers. I am also happy to answer questions via at September 16, 2009

Thank You! Presentation (+Q&A!) will be published –MacSysadmin.se website –SpamAssassin website Questions & Answers September 16, 2009