Hello there bass If you followed these steps for having connection to that android telephone?okay. Think that the correct information on the server parts are invalid or not good configured. . You manually enter them into the apps , for the part of incoming and outgoing mail server settings in the worst case scenario the desktop setting are also invalid. Be sure that username passwords login names are oke and made up correct to use. You can send me that error message with https://support.mozilla.org/en-US/kb/how-to-make-screenshots if there are numbers and messages to on it. Greetings googlethunderbird.