libgpgme11-1.8.0-neon0+16.04+build4 is installed and does not contains libgpgme-pthread.so.11 kmail version is 4:16.08.2+p16.04+git20161118.0531-0
I can confirm this bug. dpkg -S libgpgme-pthread.so.11 returns nothing. dpkg -L libgpgme11 shows there is no such library in libgpgme11, where I think it should be.
gpgme 1.8 is no longer creating the libgpgme-pthread. If kmail still is searching for this library, then this means that a number of packages needs a rebuild against the newer gpgme version. Is this still an issue with the dev-unstable build of Neon ? I guess that by now packages have been rebuild and it should be ok.
I confirmed this is resolved from today update (dev/stable). Thanks a lot guys. You definitively rock ! I don't understand those criticism towards kontact. I was just annoyed the whole week by the ergonomy and search functionality of thunderbird. Thanks a lot for the time you are dedicating making kde always better.