I have a customer using exchange 2003 within SBS2003 in a server using a fixed IP address. They have 3 .org domains that can receive mail. They have a website but it is not hosted by the same server, but on a totally different address, with all A records pointing to the website address. All mail delivered to the .org domain names is filtered by a third party (AppRiver) which does the filtering by the following method: the exchange server is given several AppRiver IP addresses as the exclusive sources of any email. The MX records (2) are setup to transfer mail to AppRiver forany of the .org domain names. AppRiver sends filtered mail then to the fixed IP address of the exchange server. This all works very well.
The problem and question is this: Some important contacts mailservers are rejecting email sent from the exchange server due to spf test failure. Can anyone provide a step-by-step method to add spf to this server? For expediancy, I am not accepting references to websites or books as a solution, I already am aware of them.