I had an att.net account on Thunderbird, worked fine up until a couple of weeks ago. Started not accepting password and getting att.net inbound server inaccessible errors. Deleted the account and tried to set up new att.net account using default parameters. Same results. Has att.net change something to their default config and Thunderbird missed it? I can still access (send and receive) my att.net (yahoo) account online so I know it's still active. Thanks, Bill.