Earthlink E-mail Settings for iPhone

Outgoing Mail Server Configuration

Server Hostname smtpauth.earthlink.net
Server Port 587
Username The part before the @ sign of your e-mail address
Authentication Password
SSL/TLS Yes

Incoming (IMAP) Mail Server Configuration

Server Hostname imap.earthlink.net
Server Port 143
Username The part before the @ sign of your e-mail address
Authentication Password
SSL/TLS Yes