/etc/logrotate.d/mimedefang is in mimedefang 2.83-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 | /var/log/mimedefang/stats {
    missingok
    postrotate
	/usr/bin/killall -HUP mimedefang-multiplexor 2> /dev/null || true
    endscript
}
 |