Mail (again!) .. how do I clean all existing settings of Mail and start again?

I have (Yosemite) Mail linking into BT.  I have a problem that occurred with Mavericks and continues with Yosemite Mail. Mail works fine for a month or two then goes wrong... almost a pattern!  Usually I put it right by deleting the account and set it up again and it works for a while.  I am so frustrated because I do not understand the intricacies of software and programming.  Now it is refusing to send emails in both my and my wife's account.  iCloud works (after I deleted and set it up again).  But I need our BT separate accounts.  Is there a way of deleting all the old bits and pieces of files that might be 'remembering' bad settings and starting again? Is there a fix?  I am alarmed by the smart-alec comments of people with 'level 5/whatever' who say there is no issue.  There damned well is!

There are a plethora of problems noted here with BT's email service, but similar could be said for various others.
You could delete the ~/Library/Mail folder along with the containers and preferences.
Note that deleting the Mail folder will delete all of your email stored on the Mac.
Inside the Mail/V2 folder are folders for each account. You could start with deleting those and the Containers, Prefs.
Containers: ~/Library/Containers/com.apple.mail
Preferences: ~/Library/Preferences/com.apple.mail.plist
However, if it works for a period of time, then stops working, it isn't dredging up an old setting from somewhere. The settings are what they are at the time; no history.
What can possibly happen, and does seem to happen with Mail periodically, is that the Keychain stores multiple passwords for the accounts.
Open Keychain Access, select login keychain, and then search for your email accounts. Delete any entries you have for the accounts.
Then, open Mail and enter the correct passwords for the accounts. That will ensure there is only one password being attempted.

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