Open mail and every email downloads

every time i open mail on my desktop, every email in my entire system pops ups in a window. it just started doing this one day, random.

You need to create a new Account and enter the correct IMAP settings. Note: Apple enters User name in both receiving and sending as the first part of your email. Most accounts actually like you to enter the full email address. Apple also defaults to ports 25. 465, 587. If you know the default port, select custom and enter port. Most accounts require SSL but not all. Verify your IMAP settings with your provider.
You can select to disable the POP account until you are happy with your new IMAP account.
NOTE: when you delete a POP account in Mail it deletes all the messages in the Inbox. You need to move all the messages in the Inbox to a custom folder under "On My Mac" or select to Archive. Under Message in the Menu bar select Archive. Apple creates an Archive folder and moves the messages into this folder. Each account has it's own archive folder.

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