Did you catch the death of Postini?
According to [acp author=”Google” title=”Postini Transition to Google Apps” id=”Goog1″ media=”website” url=”http://postini-transition.googleapps.com/” YEAR_ACCESS=”2015″ MONTH_ACCESS=”June” DAY_ACCESS=”25″]Google[/acp], all mail stopped flowing through Postini servers on June 15.
Any Postini clients who had not made the transition by the end of May were supposed to have been forcibly transitioned then.
Postini was a traditional troublespot when it came to deliverability. That shouldn’t be the case anymore.