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Cerrar![Icono de Clacks Overhead](https://addons.thunderbird.net/user-media/addon_icons/987/987849-64.png?modified=2f066f21)
Clacks Overhead 1.0.1
por Shane Eskritt
In tribute to the late Sir Terry Pratchett, many users are adding the message "GNU Terry Pratchett" into the email header "X-Clacks-Overhead". Clacks Overhead shows users when this appears in their emails and displays the message included.
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To add this header to your emails, see GNUTerryPratchett.com for instructions.