I have these lines in my ~/.gnus.el for OpenPGP signature verifying,
however, it doesn't work.

> (require 'epa)
> (require 'epg)
> (require 'epg-config)
> (setq mml2015-use 'epg)

I checked variable `mml2015-use' and it's `epg', however the variable
`mml2015-verify-function' is `mailcrypt-verify'.

Well, this problem have been bothering me for a long time, I guess it's
a configuration issue?  Do I need to change the variable myself?  I
believe it isn't wanted.

-- 
Carl Lei (XeCycle)
Department of Physics, Shanghai Jiao Tong University
OpenPGP public key: 7795E591
Fingerprint: 1FB6 7F1F D45D F681 C845 27F7 8D71 8EC4 7795 E591