It's buildt with libgpgme you can check with:
'ldd /usr/bin/kmail'
'apt-cache showsrc kdepim'
'apt-get -s remove libgpgme11'
- Frode
** Changed in: kdepim (Ubuntu)
Status: Confirmed => Rejected
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KDE-PIM isn't built with "libgpgme >= 0.4.7" as a dependency
https://launchpad.net/bugs/71012