If you get "Could not copy message" or "Can't open PGP subprocess!: No such file or directory (errno = 2)", it means your mutt and GPG are not configured to work with one another.

The solution is to source from your ~/.muttrc a mutt/gpg configuration usually in your mutt package. On Archlinux add to your ~/.muttrc:

source /etc/Muttrc.gpg.dist

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