Create a Receive Connector with PermissionGroups set to AnonymousUsers: Next, allow anonymous users to relay. This is done by allowing anonymous users the extended right ms-Exch-SMTP-Accept-Any-Recipient for this Connector: source: http://exchangepedia.com/2007/01/exchange-server-2007-how-to-allow-relaying.html
/a Creates an item with the specified file as an attachment. Example: “C:\Program Files\Microsoft Office\Office11\Outlook.exe” /a “C:\My Documents\labels.doc” If no item type is specified, IPM.Note is assumed. Cannot be used with message classes that aren’t based on Outlook. /altvba otmfilename Opens the VBA program specified in otmfilename, rather than %appdata%\Microsoft\Outlook\VbaProject.OTM. /c messageclass Creates a new [...]
If you are using Technet licences: slmgr -ipk xxxxx-xxxxx-xxxxx-xxxxx-xxxxx (Where xxxxx-xxxxx-xxxxx-xxxxx-xxxxx is the MAK key) Also see this microsoft site.