Here are the incoming and outgoing mail server settings for Earthlink and Mindspring email accounts that can be used from your iPhone :
Earthlink - use your full email address and password to login
incoming pop mail server - pop.earthlink.net - port 110
outgoing smtp mail server - smtpauth.earthlink.net - port 587
Mindspring - use your full email address and password to login
incoming pop mail server - pop.mindspring.com - port 110
outgoing smtp mail server - smtpauth.earthlink.net - port 587
Other earthlink domains - use your full email address and password to login
incoming pop mail server - pop.your-domain.com - port 110
outgoing smtp mail server - smtpauth.earthlink.net - port 587
Earthlink - use your full email address and password to login
incoming pop mail server - pop.earthlink.net - port 110
outgoing smtp mail server - smtpauth.earthlink.net - port 587
Mindspring - use your full email address and password to login
incoming pop mail server - pop.mindspring.com - port 110
outgoing smtp mail server - smtpauth.earthlink.net - port 587
Other earthlink domains - use your full email address and password to login
incoming pop mail server - pop.your-domain.com - port 110
outgoing smtp mail server - smtpauth.earthlink.net - port 587