I cannot remember how many times I try to make the `delete` key to actually trash an email in Mail.app. Click [Gmail]/Trash. Click the Mailbox menu, go to Use

I cannot remember how many times I try to make the `delete` key to actually trash an email in Mail.app. Click [Gmail]/Trash. Click the Mailbox menu, go to Use This Mailbox For, choose Trash. You're done.