When Thunderbird opens on my Lenovo Laptop new email does not load and I get partial message which says "The certificate for mail.airspeedwireless.ca is not valid for that server. Someone could be trying to impersonate the server and you should........" email account is through local ISP airspeedwireless. No problem with Thunderbird on my wife's laptop. I can access my email from my tablet. ISP tech rep doubts settings have changed on my laptop. Any and all help will be much appreciated. Thanks. tyo6570@gmail.com