Let’s Fix Thunderbird SMTP Error – Complete Guide

Overview

Millions of people use Thunderbird, a well-known open-source email client. However, it has bugs just like any other software, particularly when it comes to sending emails. The SMTP error is among the most frequent and annoying issues users encounter with. If you are here, then you must be seeing the solution of irksome “Sending of the message failed” notification. Let’s examine the reasons behind Thunderbird SMTP issues and their solutions.

What is an SMTP Error in Thunderbird?

SMTP stands for Simple Mail Transfer Protocol, which is the protocol used to send emails. When Thunderbird shows an SMTP error, it usually means it couldn’t connect to the mail server to send your message. Common error messages look like:

• Sending messages failed.
• The message cannot be sent due to the lost connection with outgoing server (SMTP). Authentication failed. Please verify (username and password).

Common Reasons of Thunderbird SMTP Error

1. Incorrect SMTP server settings like Port number, server name, and security settings etc.
2. Authentication issues such as wrong username and password.
3. In some case, Blocked ports, firewalls, VPN etc.
4. Antivirus or VPN interference.
5. Internet connectivity issues.
6. Outdated Thunderbird version.

How to Fix Thunderbird SMTP Error Manually?

Here’s a step-by-step guide that provide you guidance on how to fix Thunderbird SMTP Error:

Method 1: Cross Check SMTP Server Settings

1. Go to Mozilla Thunderbird.
2. Then click precisely on the Tools options.
3. Now go with Account Settings.
4. And click on Outgoing Server (SMTP)
5. Lastly Verify Several Things:
6. Server Name is correct.
7. Port is correct for secure connections.
8. Connection Security as required
9. Authentication Method is correct like usual password
10. Username must be full email address

Method 2: Reset the Password

Sometimes password expires or Thunderbird doesn’t save them properly. In situation follow these easy steps:

1. In Thunderbird go to Tools>Settings > Privacy & Security
2. Click Saved Passwords.
3. Remove the old password for the SMTP server
4. Send a test email, now Thunderbird will enable to re-enter it

Method 3: Overlook Port Blocking by ISP or Firewall

Some Internet Service Providers block common email ports like 25. You can move to ports like 587 or 465. Also, cross check if your firewall is blocking Thunderbird. For this, you need to go to Windows Security > Firewall & network protection > Allow an app through firewall. And also make it sure Thunderbird is allowed for both private and public networks.

Method 4: Update Thunderbird

Older versions of Thunderbird may have bugs or compatibility issues. In that case you must update it. Now for this

1. Go to Help > About Thunderbird
2. It will automatically check for updates and install them.

Thereafter, just try sending emails and overlook whether any error occur or not. If the has not been resolved then follow below steps:

1. Go to Tools option and click on the Options.
2. Choose Security and enter password.
3. Now delete SMTP password, then configure account again.
4. Try to send emails, and once It gets sent then recheck SMTP password.

Cons of the Manual Method

• For those who are not tech-savvy, these methods are quite complicated and confusing.
• It uses up a lot of user resources, including time and energy.
• There is no assurance that they will assist in promptly resolving the Thunderbird SMTP error.
• Using manual procedures also carries the danger/risk of data loss.

What Advice Do Experts Prefer to Fix Thunderbird SMTP Error?

Data loss, damage, or alteration may result from using any of the aforementioned manual fixes to resolve the Thunderbird SMTP timed out problem. For this reason, experts constantly advise creating a backup of Thunderbird data to ensure its security for future usage. Thus, the BitData Migration Thunderbird Converter tool is the perfect tool for this.

This utility provides multiple saving options, like it enables to convert Thunderbird to PST, PDF, MSG, EML, MBOX, Office 365, Gmail and many more. By taking few easy steps in seconds, users are able to tackle the error, even if they are not that tech-savvy. This application is accessible on Operating Systems for Windows, and users also have an option of free demo that enables to overlook the efficiency of the software. To know how this solution works, follow these easy steps:

Expert Way to Fix Thunderbird SMTP Error

Step1: Launch the suggested Thunderbird Backup Utility on the system.

Step2: Upload Thunderbird mailbox data using adequate option.

Step3: Now you can select any saving option as per requirement.

Step4: Choose destination path or enter required credentials accordingly.

Step5: Lastly hit the Export option.

Read more

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Conclusion

Although Thunderbird’s SMTP issues can be annoying, they can typically be resolved with a few easy checks and adjustments. This tutorial should assist you in troubleshooting the majority of SMTP issues, whether they are caused by a firewall block, an expired password, or an incorrect port. Don’t be afraid to call your email provider’s help if you’ve tried everything above and are still having trouble. They might be able to check the status of your account or server on their end. And if you find the manual solutions tricky then you can opt for the software.