How can I repair a corrupted Mail app in Mountain Lion?

Question

Let me begin by stating I've been experiencing several issues in the Mail app off and on. Today, I was having trouble with my iCloud.com account not sending or receiving.
I go to remove and re-add the account under iCloud settings under SyStem Prefs, and I'm told that the mail account cannot be setup through the Preferences pane. I'm told to set it up in the mail app itself, but this resulted in it adding the imap version, rather than using push mail.
I decided to go and find every mail app related preferences file in the library subdirectories,, and deleted the mail folder. I did not locate any other .plist file anywhere else; although I could have missed them.
Can someone please point out what else I can do to clear out Mail of all data and start fresh? Now when I launch Mail, it displays my prior account info, in spite of the prior deletions.

Answer 1

When you open Mail, and go to the accounts, highlight the account giving you problems the click the minus sign at the bottom of the column to remove that account.  The click the plus sign and setup the account again the way it should be.
See if that clears up the issue.
Alternative is to reinstall ML, but you would be better off trying to straightern out the account itself first.
To reinstall, restart holding the Command and R keys, then select reinstall, do not erase and install or you will lose all of your content.