There are multiple email accounts in thunderbird v.47 including 3 gmail accounts. One of my Gmail accounts is showing message 'Sending of password for user idesignzmedia@gmail.com did not succeed. Mail server pop.googlemail.com responded: Username and password not accepted.' Yet other Gmail accounts are fine. I've logged into Gmail using web-browser without issue. The only change is that l did link this account with master gmail account, yet password has not changed. I even tried both passwords and neither were accepted. Please advise.