[nwh]

That's crazy. The protocol for iMessage is so complicated that I gave up very quickly after getting IP banned many, many times, it's an incredibly sensitive service to things like this. At the time I just wanted to be able to check if an email address was iMessage-supported, but it required piles of signatures and other authorisation.

It will get banned on Apple's end so quickly, but not before it's used to send mountains of spam.

[terhechte]

Haha, same here. Instead I wrote an app that uses the iMessage Mac client to insert a mail address into the to: field and check whether it supports iMessage. And then I use pixelbuffer data to figure out whether the mail address has the correct iMessage supported color in the ui. Works great, but is a bit slow.

[tobinharris]

Haha, that's a great hack for checking if an email is an iMessage account. Can you gist the code :)