UPDATE: Our SMTP server now supports SMTPS or SMTP with STARTTLS
plus SMTP AUTH for mail relay authentication. We continue to support
POP-before-SMTP, but SMTP AUTH over encrypted tunnels is our preferred
method.
Introduction
POPS and IMAPS are secure versions of POP and IMAP respectively. By transmitting all information, including username and login, over an encrypted SSL connection, POPS and IMAPS provide protection against attackers reading the mail in transit or collecting username and password information.