I've been running a mailserver for myself and some others for quite some time now. Just recently (since moving to a new host) we've started seeing bounces when we send mail to email addresses that are "groups" on "Google Apps" -- we can email normal gmail and google apps addresses just fine, but when we email a group we get the:
Your email to group ... was rejected due to spam classification.
I'm not sure what I can do here. I have SPF set up and passing, I have DKIM set up and passing, and every other host (including normal Gmail) accepts my mail without issue. Is there some trick to convincing these addresses that I'm not SPAM? (Since they're often company support email addresses, it's even more annoying.)