Send automated GPG signed mail from cron job

[Tom]

Dear mutt community,

I am trying to use a GnuPG key without a passphrase to send *signed*
mails from a cron job for some non-critical, internal reporting.
Searching the archives did not give me the answer.

I'd like to use something along the lines of

|echo "this is my body text" | mutt -s "MySubject" -a
this-is-my-attachment.csv -- user at domain.com|

For this I used the approach this guy used:
https://unix.stackexchange.com/questions/643908/signing-email-with-pgp-key-outside-mutt-ui-interface

with the relevant configuration:

|source ~/.config/mutt/gpg.rc set pgp_use_gpg_agent="yes" set
pgp_default_key="8624C27DB543F03D" set pgp_sign_as="Marcel" set
crypt_autosign="yes"|

Sending the mail via the regular mutt user interface works as expected.
Using the one-line-approach above does send the mail not signed.

Is it possible with mutt (latest Debian, 1.10.1-2.1+deb10u5) to
auto-sign mails from a cron job I am trying to achieve? If yes, do you
see obvious errors?

Thanks a lot,
Tom

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