On Tue, Apr 04, 2023 at 09:00:16PM +0200, A. Schulze via Postfix-users wrote:
> Mime-Version: 1.0
> Content-Type: multipart/signed;
> boundary="mua-name=_some_random";
> protocol="application/pkcs7-signature";
> micalg=sha-256
> Content-Transfer-Encoding: quoted-printable
This is not valid MIME, "multipart/*" is required to not use any
non-identity transfer encodings. It can only be 7bit or 8bit.
https://www.rfc-editor.org/rfc/rfc2046#section-5.1
As stated in the definition of the Content-Transfer-Encoding field
[RFC 2045], no encoding other than "7bit", "8bit", or "binary" is
permitted for entities of type "multipart". The "multipart" boundary
delimiters and header fields are always represented as 7bit US-ASCII
in any case (though the header fields may encode non-US-ASCII header
text as per RFC 2047) and data within the body parts can be encoded
on a part-by-part basis, with Content-Transfer-Encoding fields for
each appropriate body part.
--
Viktor.
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