Hi, I am using Thunderbird 102.3.0 on my Laptop. I also use Firefox as my browser. Until recently I have had no problem sending emails. After updating my TalkTalk settings (as per their email) I cannot send but can receive emails. I have checked my settings with a friend who uses Tunderbird, Firefox and TalkTalk. The settings are identical and he has no trouble sending or receiving emails. When I send an email I get a message "Login to server smtp.talktalk user name john.cuth failed." There are three boxes Retry, Enter New Password, Cancel. I entered my normal password but it was not accepted. I then got a message "Sending of the message failed. Unable to authenticate to outgoing server (SMTP) smtp.talktalk.net. Please check the password and verify "Autentification method" in "Account Settings / Outgoing server (SMTP)." I have no difficulty sending or receiving emails on my iphone or Fire tablet. I have used Thunderbird for many years without any trouble. I have posted, on the Firefox support, problems accessing my TalkTalk mail directly or when logged into my TalkTalk account. TalkTalk seems to think that it is a Mozilla problem. If anyone is having a similar problem or knows how to solve the situation, I would be most grateful. Many thanks, John