TBird stopped working on one computer, not the other, all settings the same.

My guess is your PC is actually attempting to use the same SMTP server for both accounts. This is a common problem but easily fixed. Try this: # click to account settings pane # highlight the account that does not send # look in lower right where there is a button that says something such as 'edit SMTP server. CLick it and see if it is the correct email id. My guess is it is the email address of the other account, DO NOT change it because the other account uses it. Instead, on the same pane with the 'edit SMTP server' button, to the left of the button is a dropdown menu Click that and you should see all SMTP servers listed. find yours and set it for the account. If you have problems, post back.