POP3 SASL SASL AUTH LOGIN SASL-IR RFC1734 RFC5034 # # Server-side AUTH LOGIN REPLY AUTH + UGFzc3dvcmQ6 REPLY c2VjcmV0 +OK Login successful From: me@somewhere To: fake@nowhere body -- yours sincerely # # Client-side pop3 POP3 login authentication with initial response pop3://%HOSTIP:%POP3PORT/%TESTNUMBER -u user:secret --sasl-ir # # Verify data after the test has been "shot" CAPA AUTH LOGIN dXNlcg== c2VjcmV0 RETR %TESTNUMBER QUIT