Removing internal host names and IP addresses from message headers
How To: Remove Header from Outgoing Mails in Exchange 2007
How To: Find Exceptional Mailboxes in Exchange Environment, i.e
.All users with Forwarding Address is set.
.All mailboxes with quota limit is NOT set to default.
.All users set as hidden in GAL.
.All users whose mail item retention period is NOT default.
.All users who has some “Send on Behalf Of” set.
.All mailboxes with antispam bypass is set.
.All mailboxes with rules quota increased.