"If you use any Apple iOS devices to read your mail, you’ll be pleased to know that FastMail, with help from the big A, fully supports iOS push." This is huge! I thought it was just Apple being idiots. I didn't realize that third-party non-Exchange servers could push to iOS!!!
I wonder how that works? I found an "open source" project that apparently requires OSX server to generate "com.apple.servermgrd.apns.mail" push gateway certificates: https://github.com/st3fan/dovecot-xaps-daemon
