APNS
The native built in mail app on Apple iOS
does not use APNS for push. It uses a long poll request from the
app to the server using the Exchange ActiveSync protocol. Individual
users can disable this if they do not want to do push and switch their
account settings on the iOS device to Fetch New Data as Fetch instead of
Push. On the device, go to Settings->Mail->Fetch New Data->
Find your Traveler account and change the settings from Push to Fetch or
Manual. You can also change the Fetch settings to be either every
15, 30 or 60 minutes (or manual).