Sep 17, 2018

Email anti-spam techniques

There are two big kinds of anti-spam techniques,

  1. content based technique 
  2. connection based technique

Content based technique use mail content for detecting spam mail. Connection based technique doesn't use mail content, just use connected host, from address, recipient addresses and so on for detecting spam mail.

Connection based technique has good detection rate and more lower load than content based technique. But it will not work well against spam mails that uses normal mail server like Gmail. But content based technique will be able to detect spam mails that can't be detected by connection based technique.

Mainstream anti-spam technique:
  1. detects most spam mails by connection based technique.
  2. detects spam mails that can't be detected by connection based technique by content based technique.
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