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Email Tech

APOP

APOP (Authenticated Post Office Protocol) is a secure version of POP3 that encrypts user credentials during email retrieval.

APOP enhances the standard POP3 protocol by using a challenge-response authentication mechanism that encrypts the username and password. This prevents credentials from being sent in plain text, reducing the risk of interception. While largely replaced by more modern protocols like IMAP with TLS, APOP was an important step toward secure email access.
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