I can receive email from " centurylink.net " but I can't send messages. I believe I was autumnally upgraded to T-bird 78, as I've used T-bird for years without problems. At first I was " locked out " of using my two accounts with T-bird & outlook ..... but after consulting with centurylink support, plus.......outlook.....I resolved problems except for sending emails from centurylink.net. I've included upon request from T-bird support two attachments hopefully, showing " error message" and' T-birds outgoing server info.' I've changed my centurylink.net PassWord , and that enabled messages to arrive in T-bird. I have filled in new password in window for password , but I still can't send! I also have correct port...following are error messages I receive: "sending of username did not succeed. Mail server pop.embarqmail.com responder: highermark is not an invalid mailbox. Account should be fully qualified email address."...." Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMPT) smtp.embarqmail.com timed out . Try again" I tried again.....and again several times but message still isn't sent. i will contact centurylink support again, as password may need to be changed again............but I receive messages now, at least. I DON"T want that to lock me out again. mj