Given below are the frontier Email Settings for the IMAP account:
Select IMAP in account type.
Enter imap.frontier.com in Incoming Server Name.
Security Type: SSL
Username: your complete frontier email address
Password: Enter your account password

Frontier email settings for POP3:
Select POP as your Account type.
Now enter pop3.frontier.com in the Incoming Server Name.
Enter 995 in the Port field.
Security: SSL
Username: Enter your complete frontier email address
Password: Your account password

Frontier email Outgoing (SMTP) server settings:
SMTP Server name: smtp.frontier.com
Port number: 465
Security Type: SSL
Username: Enter your frontier email address
Password: Enter your account password

You can use these frontier email settings to configure your account on any mail application or client. Note that if you want to set up your account as IMAP, you can simply go through the automatic setup and avoid all the fuss. Try the manual setup if you face any issue with the automatic setup or need to configure your account with POP3 protocol.