Can I save my emails to documents?

I like to save my emails and have MANY folders in the Mail program - some with many emails in them. I find that the mail program doesn't like a lot of emails floating around - if my sent, trash and junk mail folders aren't cleaned out every few weeks - my mail program gums up.

Is there a way to save the emails to my documents?

Also - does anyone know why the program puts some of the emails in the 'archive' folder?

Thank you for your help

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