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Spam Filter

Definition - What does Spam Filter mean?

A spam filter is an email service feature designed to block spam from a user’s inbox. Because a large amount of global email messages are spam, effective spam filters are critical to maintaining clean and spam-free inboxes.

Techopedia explains Spam Filter

By keeping pesky spam emails away, spam filters increase user efficiency by sparing tedious manual sifting of legitimate messages and spam email deletion.

There is no such thing as a perfect spam filter. Even the most popular email services are susceptible to two major weaknesses:
  • Even the best spam filters are unable to block 100 percent of spam messages.
  • Legitimate emails are often routed to junk email, or spam, folders, as spam filters often misclassify legitimate emails.

Thus, even established spam filters require some manual filtering, albeit to a lesser degree.

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