Hi, using mutt-1.5.23 or latest hg, the key linked here (*) mutt does not find it. When composing a message and hitting (p) and (e) for encrypt, then hitting ENTER in order to pick up the right key, it is not listed. "gpg --list-keys" shows it, and the same is valid for enigmail/thunderbird.
Thanks, Heinz. (*) https://pgp.mit.edu/pks/lookup?op=get&search=0x8B055AE86DEFF458