email problems Yosemite and Local Provider

Well finally upgraded to Yosemite the other day, lost my Appleworks stuff, working on that. The biggest problem is that it keeps removing local providers password so for SMTP not working plus I get a pop up asking me for a password it states it no account name or password. I call local provider tech, they really didn't know anything. They want to set up a new account and wipe out the current "Well you will loose all your emails". Anybody had this problem if so please help. Thanks Chris