Dear Support Team, I am writing to request assistance with an issue I am experiencing with Mozilla Thunderbird. today Thunderbird is no longer able to send outgoing emails. Incoming emails work correctly, but when I try to send a message, it fails and the email remains in the Outbox. I have already checked the following: Internet connection is working correctly Account credentials are correct SMTP settings appear unchanged The issue persists after restarting the application Could you please help me identify the cause of this problem and advise on how to resolve it? If you need any additional information (error messages, server settings, logs, screenshots), please let me know and I will provide them. Thank you in advance for your support. Kind regards,