Hello there jerryberry. We have read your message. We try to help you. Hello there what email software do you use in Thunderbird? Gmail email? Can I ask what pc or laptop you use? And the operating system of it. A virus won t change your password. You can answer me on this platform from Thunderbird. Thunderbird will not and never change a password just like that, this is the same for the server we work with. These settings can only be changed by setting a new password and entering it again with the agreement of the new one. Is there a anti virus on the computer? Or a vpn or firewall installation Greetings firefoxvolunteer.