How do mail client know which emails to send to the Spam folder?

bishal April 12, 2011
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Why does email go into the spam folder?

  1. Anonymous
    April 13, 2011 at 10:52 am

    Well as said above it works like an antivirus and there are database that are updated, some joins cloud Spam Stopper so that all others can be imunned in fast way.

    some software rates your emails and analyzes the email content spam score.
    http://www.mailingcheck.com/email-spam-score-check/

    Currently dealing with spam through two orientations: a pre-acceptation orientation and guidance post-acceptation. The first seeks to detect and block spam before reception of emails, while with the second, it detects and removes after receipt. Examples of the first orientation, are black and grey lists, authentication of the sending server, pricing of the mails, or even the implementation of legislative provisions. Post-acceptation methods include filters Bayesian, collaborative filters, prioritization of the mails, challenge/response devices

    for a liste
    http://www.theadminzone.com/forums/showthread.php?t=27175
    http://spamcop.net/bl.shtml

  2. James Bruce
    April 13, 2011 at 7:09 am

    Depends on the individual client, but generally it uses a set of rules combined with a learning based system for determining if a mail looks spammy or not, such as:

    1. Have you received mail from this person before and not marked it spam?
    2. Is this person in the address book, either by name or specific mail address?
    3. Does it contain 1 or more links?
    4. Does it contain words on the spam blacklist (such as vi@gra)
    5. Are the headers suspicious (such as FROM address not matching the actual sender?

    Learning systems then enhance these rules. I suspect that Gmail uses hints from other users too, so if lots of people mark a particular message as spam, Gmail will mark it network-wide as spam too (a little like what they're doing with search results right now)

    Hope that clears things up!