Sorry for that. This was our problem. We had set Autoreqprov: on" in our specfile and ldd benno-milter results in: linux-vdso.so.1 (0x00007ffd48bd6000) libmilter.so.1.0.1 => /usr/lib64/libmilter.so.1.0.1 (0x00007fd05e9f7000) libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fd05e9d3000) libc.so.6 => /lib64/libc.so.6 (0x00007fd05e7dc000) /lib64/ld-linux-x86-64.so.2 (0x00007fd05ec33000) Problem solved