POP3 POP3 AUTH DIGEST-MD5 POP3 AUTH PLAIN SASL SASL DOWNGRADE RFC1734 RFC2831 RFC5034 # # Server-side AUTH DIGEST-MD5 PLAIN REPLY "AUTH DIGEST-MD5" + Rubbish REPLY * -ERR AUTH exchange cancelled by client REPLY "AUTH PLAIN" + REPLY dXNlcgB1c2VyAHNlY3JldA== +OK Login successful From: me@somewhere To: fake@nowhere body -- yours sincerely # # Client-side pop3 debug crypto POP3 DIGEST-MD5 authentication with SASL downgrade pop3://%HOSTIP:%POP3PORT/881 -u user:secret # # Verify data after the test has been "shot" CAPA AUTH DIGEST-MD5 * AUTH PLAIN dXNlcgB1c2VyAHNlY3JldA== RETR 881 QUIT