These are the steps I had to use to configure K-9 mail for my Droid Razr (Android 4.0.4 Ice Cream Sandwich)
From the Home screen, tap the K-9 Mail button.
If you have not previously created this account, tap the Menu button and select Add Account.
If you have setup this account previously on your phone, tap it, press the Menu button, then More, Settings and finally Account Settings
Enter your full Cox.net email Address and Password and tap Manual Setup.
From the Setup menu, tap Fetching Mail, and at the bottom tap Incoming Server
Enter the following Incoming Mail Server information in the spaces provided:
Username - Enter your email username (do not enter “@cox.net”)
Password - Enter your email account password.
POP server - Enter pop.east.cox.net (on the West coast, you may have to enter pop.west.cox.net)
Security: SSL (Always)
Authentication: PLAIN
Port - Enter 995
Tap Next. If the screen returns to the Fetching Mail menu, the incoming server settings were correct.
Click the Back key and tap Sending Mail.
Scroll to the bottom and tap Outgoing Server
Enter the following Outgoing Mail Server information in the spaces provided.
SMTP server - Enter smtp.east.cox.net (on the West coast, you may have to enter smtp.west.cox.net)
Security: SSL (Always)
Port: 465
Require sign-in: checked
Authentication: AUTOMATIC
Username: your Cox mail user name (without “@cox.net”)
Password: your Cox password
Tap Next. If you are returned to the Sending Mail menu, the configuration was good.
Tap the Back button until you are returned to the Account page.
Notes:
depending on where you are, you may have to turn WiFi off. Some ISPs block pop mail to servers outside the ISP's domain and I have not found a way around that.
The resulting problem is that it appears to me that fetching mail over 3G or 4G uses much more battery than WiFi. 3G is definitely better than 4G from a battery life standpoint.
