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,
users must specify a valid Windows 2000 user account and password
to log on. By default, POP3 virtual servers use port 995 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 a POP3 virtual server. For
instructions on installing a certificate, see Installing a Certificate.