The latter it seems: https://support.mozilla.org/en-US/kb/openpgp-thunderbird-howto-and-faq#w_can-i-disable-the-encryption-of-the-email-subject https://support.

The latter it seems: https://support.mozilla.org/en-US/kb/openpgp-thunderbird-howto-and-faq#w_can-i-disable-the-encryption-of-the-email-subject https://support.mozilla.org/en-US/kb/openpgp-thunderbird-how...