Hi all

I configured notmuch to always add "part sign=pgpmime" to a message I'm
writing. If I try to save it as draft with `notmuch-draft-save` a dialog
with the following opens

No openpgp signing key was found for this message.
The sender of this message is "nil".
Would you like to attempt looking up a signing key based on it?

No matter what I answer to it, the draft is not saved.

In the messages buffer the following error appears:

mml-secure-epg-sign: Couldn’t find any signer names.

Greetings
Florian