Problem with an account of Mail

Question

I had, with Leopard, a Mail account that did not want to work and, after the installation of Lion, I tried to repair it.
The first thing that I did was to remove completely from Mail that account. Than I started by loading, from Mail Preferences, my Name, the Mail Address, the Pop, the SMTP and all other data, but the account did not wanted to work nor receiving nor transmitting. During the registration of the necessary data Mail notified me that, if I wanted to continue, I had to proceed Manually. At the end of registration it appeared on the right side of the "Sent" icon a triangle with an exclamation point inside. I repeated more times the account registration operation, all with negative results. I have also removed from User/Library/Preferences the file "apple.com.mail.plist" and some files in the "Mail" folder of User/Library and repeated again the registration process: always without success. At that time, to check the validity of the account parameters that I utilized, I registered the same account in Windows XP of the same iMac, and it worked immediately, both receiving and sending mails. That means that the utilized parameters are correct.
It seems that, in some place in OSX 10.7.1 of my iMac some wrong data, loaded when the operating system was Leopard, remain in some file that I'm not able to find and to remove.
Any ideas on how to fix the problem?
Notice that on the same computer (in Mac side) I have other two Mail Accounts that work perfectly.
Regards
Roberto

Answer 1

Hello
Just for test ,make a new account ( system pref ->account -> + button ) , and try configure mail again
if that work , your problem with mail locate on your account  ( preference , caches ,font somwhere into library folder )
if not work in new accout , may have problem in mail app or system
HTH
Pierre
PS : delet files into library folder could be VERRY destructive !! be carefull