Sorry about the issue you have experienced with your device. I know how important it is to have a working email on your phone. Let's get to the bottom of this issue. Please make sure the outgoing server settings are correct. Here are the settings for the outgoing email.
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You need to set up your roadrunner username and password on the SMTP outgoing mail server
You may need to change based on your local roadrunner settings. This is available if you Google roadrunner smtp server iPhone.
Outgoing Mail Server Host: mobile-smtp.roadrunner.com
Password: Your password
If needed, enter port 587 and set Secure Server to off (or without SSL)
NOTE: Apple may display the message "Do you want to try setting up the account without SSL?" User should select Yes. Apple may take a minute to verify settings and may ask again, "Do you want to try setting up the account without SSL?" Select Yes again and the setup will be complete.