Anti-spam Systems and Techniques

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Revision as of 21:48, 7 December 2007 by Leehw (Talk)
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Now a days the email system has become the most significant technology and a useful tool for human beings in the world. In the US alone, 88% of adult users have email accounts and half of email users use email systems almost every day. However, like growing email users, spam, scam, and fishing emails are increasing. Lots of email providers, such as Gmail, Hotmail, have been making an effort to protect their users from spam, scam, and fishing emails. Accordingly, I’ll discuss some new techniques for anti-spam systems and how to improve the anti-spam system on the server through SPF (Sender Policy Framework), SenderID, Domain Keys, and DKIM(Domain Key Identified Mail).

Contents

Time to replace SMTP?

SMTP is a simple and text based protocol using port 25. It was formally defined in RFC 821 as improved by RFC 1123, but today, ESMTP defined in RFC 2821 is widely used. SMTP has many security problems. However, SMTP servers became more secure as users began writing their own servers such as Microsoft Exchange Servers, Qmail and Postfix.

Anti-spam technique through Procmail

Image:Procmailrc.jpg

New Anti-spam Systems

SPF (Sender Policy Framework)

Image:Spf.jpg Image:Dns.jpg

SIDF (Sender ID Framework)

DKIM (DomainKeys Identified Mail)

Image:Email_header.jpg

Anti-spam System and Techniques

Personal tools