New comment by Eluminae on mblaze repository

https://github.com/leahneukirchen/mblaze/issues/202#issuecomment-771584792

Comment:
I think the encrypted part contain in itself multiple subparts. mblaze in it current state can't know about the signature encrypted subpart. 

Here the mpgp filter stdout

```
Content-Type: multipart/signed; micalg="pgp-sha512"; protocol="application/pgp-signature"; boundary="===============2511636010367206221=="
MIME-Version: 1.0

--===============2511636010367206221==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit

This is a test email sent from sourcehut to confirm that PGP is working as you
expect. This email is signed with this key:

447B 69E4 B34B E90B C829 A0E9 6597 04D1 A38A 93AE

and is encrypted with this key:

CAB1 2F60 BD13 A21D AB60  C510 5BAC 9232 8B7C 5D65

You may control your PGP settings here:

https://meta.sr.ht/privacy

--
Drew DeVault
sourcehut

--===============2511636010367206221==
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature

-----BEGIN PGP SIGNATURE-----

wsBcBAABCgAGBQJgGSvgAAoJEGWXBNGjipOuccMH/18vOX99CyQP/mU8fOe/3YRc
nKCmq0iVdF5WuDNA2grB5Xjat3zEOqzWirUJ2hNcDzJ+rreL5sIltVuK6JnA9hBU
/5VB7xNmJglB04cwkuDaIfbvwVkhKiivTHbY8Y4PbW9k3vH4zYUY8cDvQc8qPCZc
UTHkdXapGz5eTuorFusJB1CaxCgWBrl8xUahJVNyNmMjnqTrpbib8RqWiNAdOjlz
KiH3i/SbIDYscLdFXXSQv+m82fuOD92a60Bac4E//B4XQg9q9YyBGa5fEkS8CXUZ
KULEGLehg/hOxd4Uq7He9xrWoUVS1KtGwTSS7MfSAvYHCPerS+in/UWmlSAvTpQ=
=D3Mk
-----END PGP SIGNATURE-----

--===============2511636010367206221==--
```

The mshow and mless display it as an ordinary subpart but it is a little trickier