POP3 SASL SASL AUTH EXTERNAL SASL-IR RFC1734 RFC4422 RFC5034 # # Server-side AUTH EXTERNAL REPLY AUTH +OK Login successful From: me@somewhere To: fake@nowhere body -- yours sincerely # # Client-side pop3 POP3 external authentication with initial response 'pop3://user;AUTH=EXTERNAL@%HOSTIP:%POP3PORT/885' --sasl-ir # # Verify data after the test has been "shot" CAPA AUTH EXTERNAL dXNlcg== RETR 885 QUIT