In both examples below, the text/plain part (preceding the OpenPGP part) is not visible: <https://mail-archive.freebsd.org/cgi/mid.cgi?3a6e219f-905b-456f-8135-00e67c3652fb> <https://mail-archive.freebsd.org/cgi/mid.cgi?9107b29c-f3e2-4c07-bc21-f7f8a9731b19> Sent by Thunderbird, and: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; ---- For the first example above, <https://lists.freebsd.org/archives/freebsd-current/2026-April/010065.html> is OK.