Unable to Send Emails
For the past 24 hours I have been unable to send outgoing email. When I try I get the following verbatim message: "An error occurred while sending mail. The mail server responded: 5.1.0 Authentication required. Please verify that your email address is correct in your account settings and try again."
I have checked and, yes, my email address is correct in my account settings.
I use Thunderbird 60.9.0 as my email program.