diff -Naur cyrus-imapd-2.4.6.orig/master/conf/normal.conf cyrus-imapd-2.4.6/master/conf/normal.conf
--- cyrus-imapd-2.4.6.orig/master/conf/normal.conf	2010-12-20 14:15:49.000000000 +0100
+++ cyrus-imapd-2.4.6/master/conf/normal.conf	2011-01-12 18:36:44.000000000 +0100
@@ -35,7 +35,7 @@
 
   # this is only necessary if using duplicate delivery suppression,
   # Sieve or NNTP
-  delprune	cmd="cyr_expire -E 3" at=0400
+  delprune	cmd="cyr_expire -D 7 -E 3 -X 7" at=0400
 
   # this is only necessary if caching TLS sessions
   tlsprune	cmd="tls_prune" at=0400
diff -Naur cyrus-imapd-2.4.6.orig/master/conf/prefork.conf cyrus-imapd-2.4.6/master/conf/prefork.conf
--- cyrus-imapd-2.4.6.orig/master/conf/prefork.conf	2010-12-20 14:15:49.000000000 +0100
+++ cyrus-imapd-2.4.6/master/conf/prefork.conf	2011-01-12 18:36:14.000000000 +0100
@@ -35,7 +35,7 @@
 
   # this is only necessary if using duplicate delivery suppression,
   # Sieve or NNTP
-  delprune	cmd="cyr_expire -E 3" at=0400
+  delprune	cmd="cyr_expire -D 7 -E 3 -X 7" at=0400
 
   # this is only necessary if caching TLS sessions
   tlsprune	cmd="tls_prune" at=0400
diff -Naur cyrus-imapd-2.4.6.orig/master/conf/small.conf cyrus-imapd-2.4.6/master/conf/small.conf
--- cyrus-imapd-2.4.6.orig/master/conf/small.conf	2010-12-20 14:15:49.000000000 +0100
+++ cyrus-imapd-2.4.6/master/conf/small.conf	2011-01-12 18:37:38.000000000 +0100
@@ -26,7 +26,7 @@
   checkpoint	cmd="ctl_cyrusdb -c" period=30
 
   # this is only necessary if using duplicate delivery suppression
-  delprune	cmd="ctl_deliver -E 3" at=0400
+  delprune	cmd="ctl_deliver -D 7 -E 3 -X 7" at=0400
 
   # this is only necessary if caching TLS sessions
   tlsprune	cmd="tls_prune" at=0400