According to the Google Apps docs, SPF should be set manually. http://www.google.com/support/a/bin/answer.py?answer=178723
And indeed, there is no such record in the DNS setiings of the domain. However, when sending mail via App Engine, Google seems to add SPF automatically. At least that's how I interpret the headers on received mail. Received-SPF: pass (google.com: domain of ...apphosting.bounces.google.com designates 209.85.160.208 as permitted sender) client-ip=209.85.160.208; Authentication-Results: mx.google.com; spf=pass (google.com: domain of ...apphosting.bounces.google.com designates 209.85.160.208 as permitted sender) -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
