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Note: However, don’t do this as a first step, especially if you cannot send messages after updating Thunderbird. So update the Mozilla Thunderbird application to the latest version Solution 4- Delete and Reset SMTP Password In case the newer version of the protocols is not supported by the provider, sending and receiving messages may fail. You may have to switch to another port like 587 or 465 and contact your ISP’s support to see if they are blocking your outgoing email port.įor TLS network encryption protocol, Thunderbird 78 is looking for a higher security standard. Many ISPs block outgoing emails on port 25.By this, you can verify the cause of the error. Then turn them on and send another test email. Try sending a test email turning both antivirus and firewall software off.

In this solution, one has to verify that your outgoing email is not being blocked by your firewall, antivirus, or your Internet Service Provider. Solution 2- Check outgoing email is not being blocked Always try to make sure of using the correct SMTP server for the email address.īy following the above steps, you will be able to check whether you are using the correct SMTP.Go through your email address and check your username and password.Open the application and select Account Settings.Start the search for SMTP mail settings, if the user’s mail setting couldn’t be found.įollow the steps given below to check your SMTP. Check whether your mail server in the setting detail is the same as recommended by Mozilla.Click on the Outgoing Server (SMTP) on the window that appears.Go to Tools and select Account settings.Log in to your Mozilla Thunderbird application.To solve the issue, follow the steps below. While using the Thunderbird email client, there are some issues faced by users. Once in a while, the issue is fine, but what if you’re constantly facing Thunderbird issues? it’s high time you check out for solutions. Solutions to fix Thunderbird SMTP Server Error: Message Cannot Be Sent And one can check the bounce error message to diagnose the bouncing incoming and outgoing message problem. With the help of the SMTP error message, one can understand the problem behind the message wasn’t sent successfully. To send and receive an email, SMTP an internet standard is used by mail servers. SMTP server error or Thunderbird email not responding is the main reason behind this problem. Sometimes while using Mozilla Thunderbird users have encountered issues in sending messages. Here, we will discuss one among such issues – Thunderbird SMTP Error – Cannot Send Messages. Despite the simplicity and efficiency of Thunderbird, users also face some common email problems due to the inability to open up or unable to send emails. Mozilla Thunderbird is an open-source application that assists users with efficient management of their emails, newsfeeds, chats, and newsgroups.