Wow this is really interesting. Poooor showing from Mailgun!!!
As a Mailgun customer, I can unfortunately confirm this. A lot of our clients are having problems getting mails delivered in hotmail mailboxes. This started some weeks ago, and we haven't seen any improvement since. It is getting to a point that we're working on migrating to something else right now.
I'm sorry we let you down. If it's not too late, I'd love to get to the bottom of this today. Can you share details with me? josh [at] mailgun [dot] com
As I mentioned in the other thread, we're looking into the details concerning this test. It's not at all reflective of the actual customer experience.
It's a pretty good sign that you're posting here to be fair :)
Can you please email me the results of this? lucas [at] agencyrevolution.com - I am considering Mailgun but am hesitant after seeing this.