Hello Del Degan,
Thank you for using Apple Support Communities.
For more information, take a look at:
iOS: Troubleshooting Mail
http://support.apple.com/kb/ts3899
- This issue is often caused by an incorrect password. Be sure you have entered the correct password. If you have enabled two-step verification through your e-mail service provider, please contact them to see if you need a special password for your iOS device.
Have a nice day,
Mario