FreeNAS.org SPF problem with the forums?
There's a report of gmail marking FreeNAS forum emails as spam, because of a problem with the FreeNAS SPF records:
freenas.org itself does appear to have a valid SPF record, so maybe this is a case of the forum server(s?) sending the email directly instead of going through the "proper" mail sending host?
Either way, it's probably worth looking into. :)