I have been using Thunderbird for years with ATT POP3 email. For some reason, it stopped receiving and sending emails yesterday. I keep receiving the error message, "Sending of password for user XXX@swbell.net did not succeed. Mail Server inbound.att.net responded: [SYS/TEMP] Server error - Please try again later." My email is still working when I login to the website. I have tried changing the password and that did not work. Please help.