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Most of the time, antivirus and firewall application blocks the pouting messages of Thunderbird. Make sure that correct SMTP server is being used or not of the email address.Choose Account Settings > select account name that has issue.Open the Thunderbird and click on option of Tools.Once it is done then, check the correct SMTP setting is updated or not by following the given steps: Make sure that email provider’s site and seek for the Mail Settings > SMTP.Now, check SMTP server settings are accurate for configured email mailbox or not.Click on the option of Outgoing Server (SMTP).Choose an option of Account Settings from menu list.Open Mozilla Thunderbird in your machine > click on the Tools tab.

Therefore, it is important to inspect outgoing server settings as mentioned: Main cause of Messages Cannot Send error is due to disturbed SMTP settings. Solution to Remove Thunderbird SMTP Error This error can occur with various statements. An error comes up due to as the ISP blocks the outgoing ports as a guard against the connections, which are utilized to spend spam. SMTP server manages the whole email delivery process. If a user is unable to send any mail via Mozilla Thunderbird then, it is just due to SMTP server error. While working on Mozilla Thunderbird, users are able to receive their emails but unable to send that mail, it prompts an error message saying ‘Try again.’ It is Thunderbird SMTP Server Error- Messages cannot send.