To know if you are using IMAP or POP, choose **Configuration ▸ Edit accounts…** and refer to the **Protocol** column in the list of accounts.
1. Choose **Configuration** ▸ **Edit accounts…**, select your IMAP account in the list of accounts, and click **Delete** to delete it. Doing so does not delete any email stored on the server.
1. Choose **Configuration** ▸ **Edit accounts…**, select your IMAP account in the list of accounts, and click **Edit** to edit its preferences.