# Thunderbird Configuration on Windows for Secure Mail [[Prev|thunderbird8]] | *step 9 of 17* | [[Next|thunderbird10]] ## Set OpenPGP Options for your e-mail account 1. Edit the new configuration option for OpenPGP Security under *Edit | Account Settings* (then *Server Settings* which corresponds to your e-mail account) * (./) Enable OpenPGP support * The default *Use email address of this identity to identify OpenPGP key* is fine because GPG can lookup your Key ID from your e-mail address. * (./) Sign encrypted messages by default * (./) Use PGP/MIME by default (this is very important /!\ ) 1. Proceed to the [[Next|thunderbird10]] step [[!img tbird9.png align=left]]