Can't access my account

This indicates a security problem on the mail server end, not with Thunderbird. And, in fact, when I try to bring up the web page https://marysvilleprint.com/ , the page doesn't load. If that web site is associated with your email address, that suggests that they are, indeed, having server problems. If it's a temporary problem that they know about, they are probably working on it and it will be resolved soon. You can contact them to report the problem and for status .