IMAP Has Stronger Authentication
$ telnet/port=imap piano.opus1.com
Trying... Connected to PIANO.OPUS1.COM, a DEC-VAX running OPENVMS.
* OK Piano.Opus1.COM IMAP4 Server PMDF5.1-2.2 at Tue, 24 Sep 1996 10:59:22 MST
Example: S: * OK KerberosV4 IMAP4 Server
C: A001 AUTHENTICATE KERBEROS_V4
C: BAcAQU5EUkVXLkNNVS5FRFUAOCAsho84kLN3/IJmrMG+25a4DT
+nZImJjnTNHJUtxAA+o0KPKfHEcAFs9a3CL5Oebe/ydHJUwYFd
WwuQ1MWiy6IesKvjL5rL9WjXUb9MwT9bpObYLGOKi1Qh
C: DiAF5A4gA+oOIALuBkAAmw==
S: A001 OK Kerberos V4 authentication successful