checking PKCS7 signed emails

Hello,

I'm trying to configure mutt to automatically check PKCS7 signed emails, these
are sent by my bank.

In short, what I receive is a multipart email with an HTML file and a smime.p7s
file which I understand is the signature of the HTML.

When openning the email mutt correctly detects the data is signed, executes
openssl, but doesn't verify the signature or say anything, it just beeps, and the
"s" before the email doesn't become "S".

The output I see is this:

-------------------------------------------------------------------------------
[-- OpenSSL output follows (current time: mié. 19 ago. 03:40:59 2026) --] 
[-- End of OpenSSL output --] 

[-- The following data is signed --]

[-- Archivo adjunto #1 --]
[-- Tipo: text/HTML, codificación: quoted-printable, tamaño: 1,1K --] 

[-- Automuestra usando w3m -s -cols 100 -I 'ISO-8859-15' -T text/html -dump tmp_file --]

Here I see the text message converted from HTML

[-- End of signed data --]
-------------------------------------------------------------------------------

Any idea where is the problem?