Trash button won't work in mail app

At the bottom of the list of checked mail is a red delete button. Have you tried this instead of the icon.

 

This problem keep re-appearing for me. I do a restore to fix it, and then a week later, problem is back. Have you had any further problems?

 

You might want to also stat what email service you are using and how you have it setup. Ie gmail with exchange server.