What is APOP?

APOP, or Authenticated Post Office Protocol, is an email protocol that enables a user to get their email from a POP3 server while also adding an extra layer of authentication and protection to keep both server and user secure. With POP, a user’s username and password use normal letters and numbers, while APOP uses authentication to encrypt credentials.

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• Email protocol
• IMAP
• POP
• SMTP