How to change mail server for an IMAP account in OSX 10.11 when mail server greyed out? I need to change the mail server for a IMAP account in OSX. 

But the mail server field is greyed out (see below screenshot). Ideally i dont want to have to setup the account new from scratch a re download all the emails from the server. 

Is there a way i can edit the mail server field of an existing IMAP account ?
I found the answer after some searching via HERE


Select the Advanced Tab, uncheck the box to “Automatically detect and maintain account settings”, save change.
Go back into Preferences > Accounts, update the Incoming Mail Server to: mail.comporium.net