I know APOP is already dead and not secure (due to man in the middle attack) but I need to know if technically, that's possible for Imap4 protocol to support APOP authentication method? Or APOP is specific to Pop3 protocol?
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2APOP is specific to POP3. It was basically superseded by SASL (RFCs 2222, later 4422), which provided common authentication forms across protocols, and APOP wasn't brought along. – arnt Mar 22 '23 at 08:31