Charter.net email setup
I have tried with and without adding port numbers 25/110, still no luck.
For incoming I have mail.charter.net, username + charter.net, and password.
For outcoming I have stmp.charter.net, username + charter.net, and password.
The charter.net email settings provided on this site are intended for use on the iPhone using the AT&T EDGE network. These settings may not be compatible if the iPhone is connected to a Wi-Fi network or EDGE network from another wireless carrier.
Charter.net email setup