diff -urNad mailfilter.orig/mailfilter-0.8.3/debian/rules mailfilter/mailfilter-0.8.3/debian/rules
--- mailfilter.orig/mailfilter-0.8.3/debian/rules	2015-02-12 22:05:39.709241365 +0000
+++ mailfilter/mailfilter-0.8.3/debian/rules	2015-02-12 22:19:23.497813728 +0000
@@ -1,11 +1,13 @@
 #!/usr/bin/make -f
 
+BUILD_DATE := $(shell dpkg-parsechangelog --show-field Date)
+
 %:
 	dh $@ --with autotools_dev
 
 override_dh_auto_install:
 	dh_auto_install
-	tar -czf ./debian/mailfilter/usr/share/doc/mailfilter/contrib.tar.gz ./contrib
+	GZIP="-9n" tar -czf ./debian/mailfilter/usr/share/doc/mailfilter/contrib.tar.gz --mtime="$(BUILD_DATE)" ./contrib
 
 override_dh_auto_clean:
 	dh_auto_clean