Remove header from outgoing mails in exchange 2010

Thank to: https://blog.virtualzone.de

Solution 1:

Exchange 2007/2010 offers an easy way to accomplish this. If your transport server sends outbound email directly using DNS lookup, or delivers to a smarthost without authentication, simply remove the Ms-Exch-Send-Headers-Routing permission assigned to Anonymous Logon — a well-known security principal that refers to anonymous users, as shown below:

Get-SendConnector “Connector Name” | Remove-ADPermission -AccessRight ExtendedRight -ExtendedRights ms-Exch-Send-Headers-Routing -user “NT AUTHORITY\Anonymous Logon”

Solution 2:

Here’s how to disable adding the header (or, to be more precise, how to remove it):

1. Open the Exchange Management Console
2. Open “Transport Rules” under “Organization Configuration” -> “Hub Transport”
3. Add a new Transport Rule and give it a name (such as “Remove x-originating-ip header”)
4. Do not choose any condition (we want to apply the rule to all mails)
5. Choose “Remove header”, and modify the action to match the “x-originating-ip” header
6. Do not choose any exception (except you want to, of course)
7. Apply the new rule.