Dont know how to fix an error occurred while sending mail on Thunderbird.

Check out this article to know the proven solutions.

you might use Thunderbird to enjoy the services of various email services like Outlook, Gmail, and Yahoo.

How to Fix “an Error Occurred While Sending Mail” on Thunderbird

One highly common Thunderbird error is an error occurred while sending mail.

This issue notification usually comes when you attempt to send the email.

Instead of sending the email to the recipients, it shows you an glitch notice stating the problem.

Disable VPN to fix an Error Occurred While Sending Mail on Thunderbird

In all cases, there are some basic approaches you must try.

If this happened to you and youre looking for a solution, continue reading.

Here, Ill tell you what you should do to get rid of this annoying error.

Deactivate Antivirus and check if you can send emails using Thunderbird

Once you get that, check to find out which one works fine from your machine.

When you upgrade your Thunderbird, your machine firewall or antivirus software might start blocking you.

The reason is it might find the older version of Thunderbird trustworthy but not the updated version.

Avoid Sending One Email to Too Many Users

Now, try sending emails from Thunderbird and see if the problem reappears.

In that case, these attachments might be the reason behind this error.

If it happens, try sending fewer numbers or attachments in one email.

Ensure You are Using the Correct SMTP Server Settings

You should also take a stab at divide large-sized attachments into multiple parts before sending them.

Besides getting the too many recipients error, you might also get this warning pop-up.

The reason is simple; your email service provider isnt allowing you to send emails to bulk users.

Thus, you might stop getting the an error occurred while sending mail message on Thunderbird.

Most email services let you send a particular number of emails every 24 hours.

Crossing that limit might result in an error while sending emails in Thunderbird.

And thats the reason youre unable to send emails from it.

Does it sound like a far-fetched idea?

Still, there have been similar incidents that cause Thunderbird users issues like an error occurred while sending mail.

To keep your email account safe from unauthorized access and use, change your email password.

Thus, you could confirm whether someone else has access to your account or not.

Remember to change your email password regularly to avoid such issues.

As a result, youll get an error occurred while sending mail.

No matter how alarming it sounds, it does happen in many cases.

In that case, contact your ISP and ask them if they are blocking the port.

You might also explain the issue to them and ask them to unblock the port.

Almost every user encountered this oops message at some point.

Ive covered all the approaches that can stop this glitch notice from appearing.