Cannot sign in to get new emails.
On December 12 I was able to get emails. On December 13, I got an error message. "Sending of user name did not succeed. Mail server mail.comcast.net responded: Plaintext authentication disallowed on non-secure (SSL/TLS connections." After closing that message, I got another one: "Login to server mail.comcast.net failed." Choices were Retry, Enter new password, and cancel. Tried entering new password, but got the original error message again. What is going on and how can I retrieve the emails that are missing. One more thing: I had version 52.9 when this happened, and updated to 6.0 but still get the same response messages.