Bluehost Web Hosting Help

Mozilla Thunderbird Not Sending Emails


I get an error sending with Thunderbird, I can receive fine and I tried sending on Port 26 and it still does not work. How do I fix this problem?


This error is most commonly caused by McAfee Antivirus, if you have McAfee running on your system, then you can follow these steps:

  1. Right-click on the McAfee System Tray icon and Select VirusScan Console
  2. Double-click Access Protection.
  3. Select Prevent mass mailing worms from sending mail. Be sure not to uncheck this box.
  4. Click on the Edit button.
  5. Add a comma at the end of the text box at the bottom of the window and then add THUNDE~1.exe. DO NOT PUT A SPACE BETWEEN THIS AND THE PREVIOUS ENTRY.
  6. Click OK.
  7. Click OK.
  8. Close the VirusScan Console window.

After this has been completed, you should be able to send e-mail again from Thunderbird.

Knowledgebase Article 74,243 views bookmark tags: cannot connect mozilla smtp thunderbird

Was this resource helpful?

Did this resolve your issue?

Please add any other comments or suggestions about this content:

Recommended Help Content

How to Change Email SMTP Port from 25 to 26

How can I change the outgoing SMTP port from 25 to 26?

Cannot Send but can Receive Email

Explanantion as to what causes this the happen and how to fix it.

Email not sending from Client or Webmail

Trying to send out emails from multiple email accounts fail from both webmail and third party email clients. Possible Reasons: The maximum emails per hour has been exceeded. This can be caused by forw

Related Help Content

VPS or Dedicated Hosting - Modify Exim Port (Mail Transfer Agent)

How to modify the Exim Port (Mail Transfer Agent) in the WHM

Setting Up Mozilla Thunderbird

This guide will show step-by-step instructions for setting up E-mail on Mozilla Thunderbird for Windows, Mac OS X, and Linux. Due to differences in the operating systems, some screens and steps might

Failed sending email from phpBB2

The most common cause is that you are either sending to or sending from an invalid email address. You will want to create a new email address, and change your profile to use a different Email address.

Shared vs. Dedicated IPs & Port Access

What is the difference between a Shared & Dedicated IP? How do I get Port Access? What type of SSL Certificate is right for me?

Problem using fsockopen function

Why am I unable to use the fsockopen function?

How to Change Ports in Eudora 6.0 and Up

I need to be able to change the port used by Eudora for incoming or outgoing mail.

Open New Ports

How can I gain access to blocked ports? What port numbers can be opened?

SMTP Settings

Explanation what SMTP settings are and guide on where to find them based on their client