What tools do you use to create an SPF record?
There are several sites out there that allow you to go through a wizard and will give you an SPF string you would add to your DNS record. Below is a sites that has a wizards for creating a record:
- Microsoft - http://www.microsoft.com/mscorp/safety/content/technologies/senderid/wizard/
There are also several sites that you can use to test your SPF records.