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Office 365 - Thunderbird - How to Add a Header to Reply Messages

This document explains how to change settings in Thunderbird to automatically add a full header to reply messages. It is relevant for Thunderbird 1.5 or later.

Thunderbird does not include headers by default when replying to a message, as shown in the example below.

Without add-on, header does not appear

To change this setting, you will need to download an add-on and install it in Thunderbird.

  1. Open a web browser and go to
  2. At the bottom of the page, right-click on the link Change_quote_and_reply_format and choose Save Link As.

    Save Link As

  3. Save the file to the Desktop.
  4. Open Thunderbird.
  5. Go to the Tools menu at the top of the screen, and click Add-ons from the drop-down menu.
  6. Click Install, and navigate to the file you saved to the Desktop. It should be named changequote-
  7. Open the file and click Install Now.
    Note: The Install button will change to Install Now after the countdown ends.

    Click Install to use the add-on

  8. Click the Restart Thunderbird button.
  9. After Thunderbird re-opens, go to the Tools menu at the top of the screen, and click Add-ons from the drop-down menu.
  10. Choose Change quote and reply format from the menu, and click Options. (For mac, click Preferences.)
  11. Under the "Reply header" tab, select the first radio button, Extended reply header. Click Ok.

    Choose the first radio button

  12. Close out of the Add-ons window.
  13. Test the add-on by opening an email and clicking Reply. You should see the full header above the original message.

    Full header appears in reply message

See Also:

Keywords:mozilla thunderbird email reply replies header   Doc ID:7037
Owner:Help Desk KB Team .Group:DoIT Help Desk
Created:2008-02-06 18:00 CSTUpdated:2021-10-07 13:44 CST
Sites:DoIT Help Desk
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