Without having pinentry package installed, encryption in kmail doesn't work. Kmail needs pinentry to open a window where user is asked for a password to his key. How about making pinentry a depend of kmail (and kdepim) - installed when +crypt USE flag is set?
I had to figure out that I need pinentry to enter password... pinentry should be in kmail's deps or there should be einfo about pinentry.
Added it to kmail-3.5.2-r1 ppc64 herders: pinentry is not ~ppc64, so I had to !ppc64 it. Would you keyword it, please!?
So you can hear my call...
added ~ppc64 to pinentry and removed !ppc64 from kmail ebuild. Marking as FIXED.