Please rename the evolution folders in your home directory that can found here:
After that you can restart evolution with a new configuration of your emal-accounts.
If you do not see this folders with beginning with a "dot" you must first make this visible because by default you cannot see that in nautilus.
Press ctrl + H or strg+H to make this folders visible.
After a new configuration of your email-accounts if you have not problems so far, you can delete the renamed folders because you don't need them.