Manual Solution For Thunderbird Not Receiving Emails SMTP Error

Email has evolved since its rise in the 90s. However, Mozilla’s Thunderbird has been around as much as other email providers. The most unique part of Thunderbird is its features:

  • Offers email
  • Provides newsfeed
  • Enables chat and newsgroup, AND
  • Is desktop-based

But with that said, Thunderbird can come with its own flaws. What are those flaws?

In this quick guide, we’ll show you 5 common errors that you might come across in Thunderbird, and how to avoid them: 

1.Can’t Send Messages

Can’t send messages? There might be two reasons why:

  • You might have the wrong settings on Thunderbird. OR,
  • Your Port 25 is blocked by the Internet Service Provider (ISP).

Your best bet, in any case, is to do the following:

  • Look at your Settings, and see if anything needs to be changed, or if everything looks good. Your Settings should look like this:
    • Incoming mail server (POP3/IMAP server):
    • Outgoing mail server (SMTP server):
    • Username: the full e-mail address like
  • Enable SMTP authentication.
  • Use a different TCP port 2525 for SMTP Server.

If you still run into this error, then convert your emails and other components from MBOX to PST file format.

2.No Encryption Support

Encryption is extremely important when it comes to your privacy only. However, in Thunderbird, encryption isn’t supported as much as one might have hoped. Needless to say, without encryption of data, it’ll put you at risk for hacking through the server. 

Here’s how to fix that error – 2 ways, actually:

  • If your mail server supports encryption, click on the “Change Settings” button, and then modify your settings.
  • If your mail server doesn’t support encryption, check the box next to “I understand the risk,” and then click the “Create Account” button. You can also switch to a mail provider that offers a more secure connection.

3.Can’t Delete Messages

Suppose you want to delete some messages that you either might not be interested in having anymore, or you want to free up space. However, sometimes in Thunderbird, you might find it hard to delete messages. 

Why is that?

If your trash folder is corrupt, then that would explain the error. But don’t worry! This solution may help:

  • First, open the “Profile” folder by clicking on “Menu” from the top righthand corner of the Thunderbird window.
  • Second, select the “Help” option.
  • Next, click on the “Troubleshooting Information” tab.
  • Then, click the “Open Folder” button under “Application Basics,” where a new window will pop up and display a list of profile files.
  • Close Thunderbird.
  • Open either the Mail folder or ImapMail folder in the File Manager.
  • Use incoming mail server name (i.e., or to open the folder.
  • Choose “Trash” and “Trash.msf” files (either labeled as “Deleted” or “Bin”), and then erase them.
  • Then, restart Thunderbird, where a new Trash folder will be created.

If the error still persists, switch the emailing app to Microsoft Outlook by moving all the data from MBOX to PST files.

4.Thunderbird Not Receiving Emails

Sometimes, Thunderbird might stop receiving email messages without warning. Don’t panic – It’s not my fault. In fact, this error might be due to the following reasons: 

  • Technical issues with ISP
  • Account configuration issues, OR
  • Filters set in either ISP or Thunderbird

The solution? Go to your Thunderbird account settings, and do the following:

  • Select the “Tools” button. 
  • Then, go to your Account Settings.
  • Next, select “Server Settings” from the dropdown menu that you’ll see on the left panel.
  • Then, verify the server settings. (You’ll need to go according to the specifications given by the account provider).


Finally, nothing annoys computer users than crashes. In the case of Thunderbird, crashes can mean unexpected collapse or halting of the app. When this happens, the Mozilla Crash Reporter will appear, and then ask you if whether or not you want to send the crash information to Mozilla.

But how exactly did the crash happen? 

Well, much of the issue revolves around the fact that sometimes add-ons can interfere with Thunderbird’s performance. Therefore, it’s important to update your app regularly to ensure a smooth performance every time. 


As you can see, there are many things that can go wrong on Thunderbird. But don’t fret! By following this quick guide, you’ll avoid errors that might’ve not been so serious after all. 

Author Bio:

Christina Lee is a writer and editor at Academic writing service. As a project manager, she has overseen various projects in many companies nationwide. As a content writer, she writes articles about coding, computer science, and technology trends.

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