In the past few weeks we’ve been actively using Postmark with Beanstalk as well as a few other initial beta testers. The service is working extremely well and we’re very close to opening it up. At the moment, Beanstalk alone is sending over 20,000 emails per day through the API. We’re also happy to have libraries for Rails, Python, PHP, and Magento almost ready to go.
As we iron out some of the UI bugs and polish the features we’ll start inviting more people. For now, here is a quick screen shot of the server overview page.