I did a mistake. I was using the old generated messages. I generated new messages now, and things changed.
The only message that does not work the right way is HTML + attachment + signature. The "decypted" message and "signature verified" message are missing. But decryption works fine.
[image: Inline image 1]
Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=_dfa816b4e353745a697c0959358b80aa"This is an OpenPGP/MIME signed message (RFC 4880 and 3156)--=_dfa816b4e353745a697c0959358b80aaContent-Type: multipart/mixed; boundary="=_6add61e941ee3ae96dc0b235baf64610"--=_6add61e941ee3ae96dc0b235baf64610Content-Type: multipart/alternative; boundary="=_8dded80302f1837e475b3c8bd7a879c8"--=_8dded80302f1837e475b3c8bd7a879c8Content-Transfer-Encoding: 7bitContent-Type: text/plain; charset=US-ASCIIasdasd asdasd asdasa--=_8dded80302f1837e475b3c8bd7a879c8Content-Transfer-Encoding: quoted-printableContent-Type: text/html; charset=UTF-8<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; charset==3DUTF-8" /></head><body style=3D'font-size: 10pt; font-family: Verdana,Gen=eva,sans-serif'><p>asdasd</p><p>asdasd</p><p>asdasa</p></body></html>--=_8dded80302f1837e475b3c8bd7a879c8----=_6add61e941ee3ae96dc0b235baf64610Content-Transfer-Encoding: base64Content-Type: text/plain; name=globdata.iniContent-Disposition: attachment; filename=globdata.ini; size=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--=_6add61e941ee3ae96dc0b235baf64610----=_dfa816b4e353745a697c0959358b80aaContent-Type: application/pgp-signature; name=signature.ascContent-Disposition: attachment; filename=signature.asc; size=819Content-Description: OpenPGP digital signature-----BEGIN PGP SIGNATURE-----Version: GnuPG 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2UJ0-----END PGP SIGNATURE-------=_dfa816b4e353745a697c0959358b80aa--
About being able to download inline signature in a plain text email, I don't remember about Enigmail, but for the sake of consistency it would be good to be able to always download it.