diff -Nru dovecot-1.2.12/debian/changelog dovecot-1.2.12/debian/changelog
--- dovecot-1.2.12/debian/changelog	2010-07-09 14:39:24.000000000 +0100
+++ dovecot-1.2.12/debian/changelog	2010-09-23 09:02:39.000000000 +0100
@@ -1,3 +1,10 @@
+dovecot (1:1.2.12-1ubuntu4) maverick; urgency=low
+
+  * debian/mail-stack-delivery.preinst:
+    - Properly close switch/case statement (LP: #645808)
+
+ -- Niall Creech <niallcreech@gmail.com>  Thu, 23 Sep 2010 08:58:04 +0100
+
 dovecot (1:1.2.12-1ubuntu3) maverick; urgency=low
 
   * debian/rules,  debian/dovecot-common.dovecot.upstart, debian/control,
diff -Nru dovecot-1.2.12/debian/mail-stack-delivery.preinst dovecot-1.2.12/debian/mail-stack-delivery.preinst
--- dovecot-1.2.12/debian/mail-stack-delivery.preinst	2010-06-29 14:29:09.000000000 +0100
+++ dovecot-1.2.12/debian/mail-stack-delivery.preinst	2010-09-23 09:02:54.000000000 +0100
@@ -44,8 +44,8 @@
     fi
 
 
-# Check if mail-stack-delivery.conf had any customizations
-if [ -f "/usr/share/dovecot/mail-stack-delivery.conf" ]; then
+	# Check if mail-stack-delivery.conf had any customizations
+	if [ -f "/usr/share/dovecot/mail-stack-delivery.conf" ]; then
        if [ -f "/etc/dovecot/mail-stack-delivery.conf" ]; then
                mv /etc/dovecot/mail-stack-delivery.conf /etc/dovecot/mail-stack-delivery.conf.bak
                DIR=`mktemp -d`
@@ -61,6 +61,16 @@
                rm -rf $DIR
        fi
        
-fi
+	fi
+	;;
+	
+    abort-upgrade)
+    ;;
+
+    *)
+    echo "preinst called with unknown argument \`$1'" >&2
+    exit 1
+    ;;
+esac
 
 #DEBHELPER#