Email notifications: SPF

Here's one for somebody to sort out: Gmail has started regarding email notifications from the forums as suspect. A header from a recent message:

Authentication-Results: mx.google.com; spf=hardfail (google.com: domain of forums@adobe.com does not designate 209.46.39.252 as permitted sender)

209.46.39.252 is mail.sgaur.hosted.jivesoftware.com, the server sending the messages. The SPF result used to be 'neutral'. I wonder how many notifications end up in posters' gmail spam filters because of that 'hardfail'. It can't be too difficult for Adobe to publish an appropriate record.

Noel