Content filtering - Spam
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Content filters act either on the content, the information contained in the mail body, or on the mail headers (like "Subject:") to either classify, accept or reject a mail. Like the name implies, the filter filters out unwanted text or letters, thus saving the receiver time. Usually, Anti-Virus methods can be classified as content filters too, since they scan (simplyfied) either the binary attachments of mail or the HTML contents.
[edit] Common Filters
Common content filters are:
- Bayesian
- Attachment
- Mail header
- Mailing List
- HTML anomalies
- Language
- Heuristic
- Regular Expression
- Phrases
- Proximity
- URL
- Content-encoding
- Char-set
