A couple of days ago I tried emacs-27 and was amazed at how quick it was
in things like building my agenda. But I did find a problem in trying to
send an email using gnus which was -

--8<---------------cut here---------------start------------->8---
(error "Couldn’t find any signer names; try setting `mml-secure-smime-sign-with-sender'.") in mml-secure-epg-sign
--8<---------------cut here---------------end--------------->8---

I couldn't find any reference to the message in the emacs-27 manual, nor
online, so please, how should I deal with the error message please?

Thanks
Sharon.
-- 
A taste of linux = http://www.sharons.org.uk
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Debian 10.2, fluxbox 1.3.7, emacs 26.3, org 9.3.6