Your package postler failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=6974861 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_21_Mass_Rebuild
Created attachment 904967 [details] build.log
Created attachment 904968 [details] root.log
Created attachment 904969 [details] state.log
This package has changed ownership in the Fedora Package Database. Reassigning to the new owner of this component.
I have retired postler in rawhide, upstream suggests to use geary instead.