Secure Sockets Layer (SSL) is an
encryption method for sending messages over a secure channel. If a
virtual server is configured for Basic Authentication over SSL, a
user must specify a valid Windows 2000 user account and password to
log on. By default, IMAP4 virtual servers use port 993 for SSL
communication. If you are configuring multiple virtual servers, you
must change the default SSL port to create a unique combination of
IP address, TCP port, and SSL port.
Important
In addition to setting the SSL port number, you must request and
install a certificate to
enable SSL on an IMAP4 virtual server.