Hi! My BT Yahoo account was locked because someone had tried to access it 'without permission' I changed my password and now its unlocked. Incoming & outgoing all OK on my phone and iPad. All the settings and new password OK on Thunderbird. I can get incoming mail, but I'm unable to send mail. I have another Yahoo account on Thunderbird that's now suffering the same symptoms. Both work fine on the Desktop Yahoo app. I have a Gmail account that works OK on here. I uninstalled/reinstalled one account but when reinstalling I get the message "Unable to log in at server. Probably wrong configuration username or password" but I'm sure it's all correct. Any suggestions would be most welcome.