20 REPLY "AUTH DIGEST-MD5" + Rubbish
21 REPLY * -ERR AUTH exchange cancelled by client
23 REPLY dXNlcgB1c2VyAHNlY3JldA== +OK Login successful
48 POP3 DIGEST-MD5 authentication with SASL downgrade
51 pop3://%HOSTIP:%POP3PORT/881 -u user:secret
56 # Verify data after the test has been "shot"
63 dXNlcgB1c2VyAHNlY3JldA==