Hi Guardianoftheemail, the operating system of each of your devices must provide underlying support to TLS for a mail client to send and receive mail. Each operating system supports different versions of TLS and SSL. Some devices and email clients combine SSL and TLS into one authentication option of SSL/TLS. If there is no explicit TLS option, choose the combined option of SSL/TLS and check the authentication box, if available. Within the Outlook "Email Settings" window, the authentication box is usually located on the Outgoing Server tab. You can find the Cox IMAP server settings at
www.cox.com/.../imap-server-settings.html. The outgoing server port depends on the encryption options available in your email client. -Becky, Cox Support Forums Moderator