> Try removing (require 'pgg-epg) from your ~/.gnus setting.  Or, enclose
> mml2015-gpg-extract-signature-details function definition in pgg-epg.el
> with eval-after-load "mml2015".

didn't work.

but i discovered that if i press W s the message gets verified and the
pgp button appears, but i should press W s for each message...

so i tried:

(add-hook 'gnus-select-article-hook 'gnus-summary-force-verify-and-decrypt)

but this didn't work: it takes ages showing each unsigned message, and
fails (too many recursions) on signed ones.

what can i do?

thanks again