POP3 SASL SASL AUTH PLAIN RFC1734 RFC4616 RFC5034 # # Server-side AUTH PLAIN REPLY AUTH + REPLY AHVzZXIAc2VjcmV0 +OK Login successful From: me@somewhere To: fake@nowhere body -- yours sincerely # # Client-side pop3 POP3 plain authentication pop3://%HOSTIP:%POP3PORT/%TESTNUMBER -u user:secret # # Verify data after the test has been "shot" CAPA AUTH PLAIN AHVzZXIAc2VjcmV0 RETR %TESTNUMBER QUIT