Incoming mail server has changed, but greyed out in Mail, can't be corrected

Question

The incoming mail server for my website's email account has changed, but the incoming server box is greyed out and doesn't allow me to change it to the correct one.  I do not want to delete the account and start again because all mail and contacts associated with the account will be lost.  So far all the suggestions regarding greyed out incoming server boxes have to do with iCloud but while i use iCloud, I don't use it for mail or have an @iCloud email address.  They also involve starting from scratch with Mail, which would be a huge problem for me trying to save all my emails and reconstruct my mailboxes.
What gives with this issue? a lot of people seemed to have it, though I saw no responses later than 2012.  Unlike other people, I can still get my mail, but the server certificate always comes up invalid.  I can tell Mail to trust it, but This greyed out thing is certainly a bug or unintended consequence.  I want to be able to change that field.

Answer 1

Sorry, Guess I solved my own problem anyway.  Perhaps this will help others.  I unchecked "automatically detects and maintain account settings", closed and saved the mail preferences window ( I had also updated my outgoing server info which was not greyed out )  I closed Mail and when I reopened it, the incoming server was no longer greyed out and I could change it which I did.  I may recheck the auto detect box once I have ensured that the port settings are all correct.