AntiSpam - Understanding the good, the bad and the ugly

AntiSpam Understanding the good, the bad and the ugly By Aseem Jakhar Confidential

About Me ,[object Object],[object Object],[object Object],[object Object],[object Object]

Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is spam? ,[object Object],[object Object],[object Object],[object Object],[object Object]

Spam side effects ,[object Object],[object Object],[object Object]

Difficult problem to solve ,[object Object],[object Object],[object Object],[object Object]

Messaging Primer ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Path of a Message MUA MSA/MTA MTA/MDA MTAs Message Store MUA

Email Format: Received Headers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Email Format: Other headers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Email Format: MIME contd. And email Body ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Getting inside a spammer’s mind ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Layered Security ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Anti-Spam Technologies - ACLs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Anti-Spam Technologies - ACLs ,[object Object],[object Object],[object Object],[object Object],[object Object]

Anti-Spam Technologies – Content Filtering ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Anti-Spam Technologies – Content Filtering ,[object Object],[object Object],[object Object],[object Object]

Anti-Spam Technologies – C/R ,[object Object],[object Object],[object Object],[object Object],[object Object]

Anti-Spam Technologies – Sender Driven ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Anti-Spam Technologies – Sender driven ,[object Object],[object Object],[object Object],[object Object],[object Object]

Anti-Spam Technologies - Heuristics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Exploiting the Loop Holes – Evading filters ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Exploiting the Loop Holes ,[object Object],[object Object],[object Object],[object Object],[object Object]

Exploiting the Loop Holes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Exploiting the Loop Holes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Thanks ,[object Object],[object Object],[object Object]

AntiSpam - Understanding the good, the bad and the ugly

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AntiSpam - Understanding the good, the bad and the ugly