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Download How to Secure Mozilla Thunderbird (PDF, 459 KB)

Every day we receive spam email. Some spam will be from criminals who wish to compromise our computers or defraud us. Therefore, spam is a security issue, not just a nuisance.

It is possible to improve email security by using settings in your email software to block or warn you about potentially harmful content and attachments (or executables) before you open them. By securing your email client you can help prevent this from
happening. These settings are for Mozilla Thunderbird 2.0.x and need to be enabled for each user account on the computer.

1. Open Mozilla Thunderbird.
2. On the Menu bar, select Tools
3. Click on Options
4. Click on the Privacy Button

   

5. Select the Junk Tab and check the option “When I mark messages as Junk, move them to the account’s Junk folder” and select the radio button “Move them…”. This means that any further spam emails from this sender will automatically be filtered out of your inbox.
6. Select the Email Scams tab and check the option “Tell me if the message I am reading is a suspected email scam.”
7. Select the Advanced Button

   

8. Click the “Config Editor” button a dialog window opens. In the filter field, type the word “javascript”.
9. Alternatively, click the row labeled “javascript.enabled”. A context menu appears. Click the Toggle label until the value is “false”. This will disable JavaScript. It will be similar to the image below.

   

10. This will disable potentially harmful scripts in emails.