Anti-spam meaning

The methods that detect email messages that are unsolicited advertisements, called "spam." A spam filter is used to detect spam and divert it to a spam folder (junk mailbox). See spam filter, spambot and email obfuscator.
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Countering spam (unwanted electronic mail).
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Opposed to spam.
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Origin of anti-spam

  • anti- +"Ž spam

    From Wiktionary