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  1. #1
    SitePoint Guru phantom007's Avatar
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    Question How they detect spam mails?

    Hi

    I was wondering how do email providers like gmail, yahoo detect spam mails and mark them as spam? How do they know which mail is a spam and which is not.

    Just theoretically I want to know.

    Any help is appreciated.


    thanks

  2. #2
    SitePoint Enthusiast ravi_k47's Avatar
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    I may not be that accurate but

    - hidden texts in the e-mail (HTML)
    - undefined parameters in the mail headers(giving proper information like from address, to address,reply-to address, subject etc
    - language, grammar etc

  3. #3
    SitePoint Wizard silver trophy kyberfabrikken's Avatar
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    Mailchimp has a couple of good articles about the topic:

    http://www.mailchimp.com/articles/#deliverability

  4. #4
    SitePoint Wizard Mike Borozdin's Avatar
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    I would search for research papers on this topic, for example, http://scholar.google.com/scholar?hl=en&q=spam+filter

    Unfortunately, people usually don't blog about it.

  5. #5
    SitePoint Wizard
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    The workings of SpamAssassin is a starting point for research. The big mail providers also have the advantage of being able to know when an email was sent to a large pool of users.


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