How to fix Thunderbird "Send Message Error"

Thunderbird is an open source, desktop-based application known for its self-awareness of emails, newsfeeds, calendar, groups, etc. can prove to be a very annoying situation.Users may encounter ‘Thunderbird SMTP error, unable to send message’, if their firewall, antivirus or internet service provider prevents sending emails. It could also be that the correct SMTP port is not configured.

How to resolve Thunderbird SMTP error?

We have chosen to write some of the most effective methods to help you resolve Thunderbird not sending emails error.

Method 1: Examine SMTP settings

• Launch Mozilla Thunderbird.

• Click on the three bars ( ) on the upper right corner of your screen and select Account Settings from the drop-down list.

• From Account Settings, select Outgoing Server (SMTP) and verify that the SMTP server identification for the account configured as recommended by Mozilla is correct.

Method 2: Enable Antivirus and Firewall settings

You should check if your firewall or antivirus settings are blocking your emails. Sometimes, your internet service provider blocks outgoing emails for a variety of reasons, such as emails on the wrong port. Follow the steps below to learn how to fix it.

• Try enabling your firewall protection and antivirus and sending a test mail. Then turn them back on and try to submit the test paper again. This will let you know the error you are facing.

• Try switching to port 587 or 465 as ISPs typically block port 25. Also try contacting your ISP support to see if they are blocking your outgoing email.

Option 3: Turn off the the SSL/TSL protocol

If your users do not support the latest version of the SSL/TSL protocol, Thunderbird may generate an error to send email. In Thunderbird, go to Account Settings and enable the SSL/TSL protocol and try sending a test mail to see if the error subsides.

Option 4: Update your Thunderbird app

Thunderbird can cause problems if not updated to the latest version. Try sending a test card after updating your application to see if the ‘Thunderbird not sending emails’ error is fixed or not. If it persists, delete the password and reset it.

Method 5: Reset the SMTP password

It is rare that the SMTP password is wrong so keep this option as your last resort. Follow the steps below to reset your password:Start Thunderbird and click on the Settings icon.Click Privacy and Security.Select Saved Passwords from the Passwords section.Select the desired password and click Remove.Reconfigure the email account and try sending email again. This can solve your problem.

Limitations of artificial methods

These methods may be confusing for non-technical people.Manual methods are very unreliable. These methods are not always successful if it is a compatibility issue or involves a software malware.Changing system settings creates a lot of risks that can corrupt your mailbox.

Option 6: Export your MBOX files to another email client

To avoid these errors in the future, we suggest you switch to another email client such as Outlook. This is a popular email client that manages all your accounts easily. To transfer your email from Thunderbird to Outlook, try using Webbyacad software for MBOX to PST tool . It makes it easy to convert your MBOX files to files like PST. It supports 20 different email clients and there is no risk of data loss.

Conclusion:

It’s frustrating when users try to send an important email but cannot. We have described a few ways to handle this error. Though if you frequently encounter this error, then you may want to migrate to another email client such as Outlook. With the help of a professional tool like Webbyacad Software for MBOX, you can easily switch from Thunderbird to PST software in Outlook.