added script to get virtual mailbox/domain size stats

mailbox_usage.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+#
+# Lists mailbox size of all virtual users
+# of all domains
+
+PER_USER="/var/vmail/*.*/*"
+PER_DOMAIN="/var/vmail/*.*/"
+TOTAL="/var/vmail/"
+
+du -sk $PER_USER | sort -rn | awk '{print $2}' | xargs -ia du -hs "a" | awk -F"/" '{print $1,$5,"@"$4}' | sed 's/ @/@/g'
+echo -e "\r"
+du -hs $PER_DOMAIN | sort -n | awk '{print $2}' | xargs -ia du -hs "a" | awk -F"/" '{print $1,$4}'
+echo -e "\r"
+du -hs $TOTAL