Please provide detail on this so someone can offer suggestions. For example, are you receiving error messages?

i cannot send emails on thunderbird

i can get emails but not send them on thunderbird

OK, some details are needed. Please share screenshot of error message and screenshot of SMTP server settings pane. That is needed information before anyone can advise on possible causes. Thank you. The SMTP server pane can be accessed by clicking 'account settings' and from the account pane, click the 'edit SMTP ' button in lower right. See attached screenshot example.

here is the error message: i cant paste it here?! it says that SMPT might be wrong. ive never had this problem and have not changed any settings. noticed the issue shortly after windows 11 was auto updated.

Please open a new thread for this and include screenshots of error message and of SMTP server settings pane.