Mail app help!!

Hey I recently just synced my yahoo mail with the mail app on the macbook pro and it initially deleted everything in my inbox I got over that problem, but the problem that keeps occurring is that after I read an email from my inbox it automatically moves it to the trash like a day later. How do I stop this? I looked through the settings for it and it doesn't say anything about what happens to it after I read the email.

Thanks for the help!


Edit: I forgot to ask if there is a way to get back all the emails I lost initially when syncing my yahoo mail with the mail app.

 

I'm using IMAp.

Thanks for the reply