The default port for POP3
connections, port 110
The default port for POP3S connections, port 995
The default SMTPS port number, 465.
true if server advertises AUTH PLAIN. You cannot get valid value before opening SMTP
session.
true if server advertises AUTH LOGIN. You cannot get valid value before opening SMTP
session.
Returns supported authentication methods on this server. You cannot get valid value before opening SMTP
session.
CRAM-MD5: [RFC2195]
A private helper method