The attached e-mail makes notmuch from git HEAD segfault:

$ notmuch --version

notmuch 0.25.1+161~g1b91884

$ notmuch show --decrypt id:86595dab-d486-536b-fe7a-ae3e1dca1a26@posteo.de

Warning: Crypto engine initialization failure (application/pkcs7-signature).

Segmentation fault

Without the --decrypt I can see the visible text, but I'm unaware on how I can make the elisp code not send this command line option.