Hello, I've been using Thunderbird for a number of years on my Windows 10 computers (one at a time). I used to have my email hosted by Cox, but it moved to Yahoo a year or two ago. At that time, I changed my IMAP and SMTP servers from cox to yahoo. Suddenly, the other day, I'm not longer able to send or receive email messages in Thunderbird. I can still send and receive at Yahoo.com. Here's the setup that I've been using in Thunderbird: Incoming Mail (IMAP) Server Server - export.imap.mail.yahoo.com Port - 993 Requires SSL - Yes Outgoing Mail (SMTP) Server Server - smtp.mail.yahoo.com Port - 465 Requires SSL - Yes Requires authentication - Yes When I click on my inbox, I get a dialog box that says: "Login to server imap.mail.yahoo.com with username davidmorrison@cox.net failed." Maybe I should set up another account, with my same name? Appreciate any help you have! PS: I DO donate every year or two to Thunderbird... Thanks. David Morrison