SMTP Server: smtp.frontier.com
Port Number: 465
SSL: Yes
Account: your frontier email address
Password: Your email password
Make sure you check This server requires a secure connection (SSL) and that the outgoing server requires authentication.
Port 25 Blocking
Port 25 is the port or connection on your computer through which outgoing email must pass. Port 25 blocking prevents spammers from sending masses of unauthorized junk email.
Frontier blocks all SMTP (Port 25) traffic over our network that is not sent through Frontier outgoing mail servers (smtp.frontier.com). This only applies if you have a dynamic IP address. If you have Frontier Business Class High-Speed Internet and have a static IP address, your outgoing email will not be affected.
If this has affected you, please change your outgoing mail server to smtp.frontier.com. You might also have to configure your email program to authenticate to our outgoing mail server.