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IMAP

Internet Message Access Protocol: a protocol email clients use to retrieve and manage messages stored on a mail server. Defenders care about it because attackers abuse IMAP access, often via stolen credentials, to read or exfiltrate mailboxes.

IMAP lets a client access and manage email kept on the server (unlike POP, which typically downloads and removes it), keeping mailboxes in sync across devices. Security-wise, IMAP is a path attackers use after stealing credentials, logging in to read, search, or exfiltrate email, and legacy IMAP often bypasses modern protections like MFA. Defenders monitor IMAP access and frequently disable legacy protocols to close that gap.

Introduced in: Networking Foundations

Examples

  • An email client using IMAP to sync a mailbox across devices.
  • An attacker using stolen credentials over IMAP to read a victim's email.
  • Disabling legacy IMAP that bypasses multi-factor authentication.