Knowledgebase: E-mail
Why can't I send using Mozilla Thunderbird?
Posted by Support, Last modified by Support on 06 April 2009 04:51 PM
This error is most commonly caused by McAfee Antivirus, if you have McAfee running on your system then you can follow these steps.

Procedure:

Right-click on the McAfee System Tray icon → Select VirusScan Console…

Double-click Access Protection.

Select Prevent mass mailing worms from sending mail. Be sure not to uncheck this box.  Click on the Edit button.

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.

Click OK.

Click OK.

Close the VirusScan Console window.

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