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.
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. Employees.org only support SSL versions of POP and IMAP.
SMTPS and SMTP with STARTTLS are methods of creating encrypted tunnels between a mail client and an SMTP server. When combined with SMTP Authentication (called "SMTP AUTH"), it is a secure mechanism for sending username/password between the mail client and the SMTP server. This authentication allows the server to know whether or not the user of the mail client is allowed to relay mail through the server.
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