POP3 SASL SASL AUTH LOGIN SASL-IR RFC1734 RFC5034 # Server-side AUTH LOGIN REPLY AUTH + %b64[Password:]b64% REPLY %b64[secret]b64% +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 %b64[user]b64% %b64[secret]b64% RETR %TESTNUMBER QUIT