I have 3 separate email accounts that I have used with Thunderbird for the past year. Suddenly today one of them stopped working. After trying several times to get mail, I deleted that account and tried to reinstall. Unfortunately I am now getting the error message "Configuration could not be verified - is the username or password wrong?" I have checked the info I inputted and it is correct. I went to webmail for my ISP and logged in with the same info, no problem. I also checked the configuration of my other two email accounts, and made sure it was all the same. I double checked the info from my ISP (ATT - Bellsouth) and it is what I see in the manual configuration. I just keep repeatedly getting this same error. I have reached the limit of what I know to do and would greatly appreciate any help! Thank you!!