diff -ur ssmtp-2.64/debian/postinst ssmtp-2.64-patched//debian/postinst
--- ssmtp-2.64/debian/postinst	2010-04-08 08:17:25.000000000 +0200
+++ ssmtp-2.64-patched//debian/postinst	2011-04-18 21:17:03.870321788 +0200
@@ -52,13 +52,13 @@
 	test -z "$FromOverride" && FromOverride=NO
 
 	touch /etc/ssmtp/ssmtp.conf.tmp
-	chmod 644 /etc/ssmtp/ssmtp.conf.tmp
+	chmod 640 /etc/ssmtp/ssmtp.conf.tmp
 
 	sed "s/^root=.*/root=$root/;s/^mailhub=.*/mailhub=$mailhub/;s/^rewriteDomain=.*/rewriteDomain=$rewritedomain/;s/^hostname=.*/hostname=$hostname/;s/^FromLineOverride=.*/FromLineOverride=$FromOverride/;s/^#FromLineOverride=.*/FromLineOverride=$FromOverride/" /etc/ssmtp/ssmtp.conf > /etc/ssmtp/ssmtp.conf.tmp
 	mv -f /etc/ssmtp/ssmtp.conf.tmp /etc/ssmtp/ssmtp.conf
 else
 	touch /etc/ssmtp/ssmtp.conf
-	chmod 644 /etc/ssmtp/ssmtp.conf
+	chmod 640 /etc/ssmtp/ssmtp.conf
 
 	exec 1>/etc/ssmtp/ssmtp.conf
 
diff -ur ssmtp-2.64/debian/rules ssmtp-2.64-patched//debian/rules
--- ssmtp-2.64/debian/rules	2009-11-23 11:33:17.000000000 +0100
+++ ssmtp-2.64-patched//debian/rules	2011-04-18 21:08:56.411904610 +0200
@@ -31,7 +31,8 @@
 	install -m 755 debian/config debian/tmp/DEBIAN
 
 	install -d -m 755 debian/tmp/usr/sbin
-	install -s -m 755 ssmtp debian/tmp/usr/sbin/ssmtp
+	install -s -m 2555 ssmtp debian/tmp/usr/sbin/ssmtp
+	chgrp mail debian/tmp/usr/sbin/ssmtp
 	install -d -m 755 debian/tmp/usr/share/man/man8
 	install -m 644 ssmtp.8 debian/tmp/usr/share/man/man8/ssmtp.8
 	install -d -m 755 debian/tmp/usr/share/man/man5