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IMAP doesn't have "push". This is something Apple built to stop wasting your battery by trying to use the terrible IMAP IDLE

• blueflow 11y ago
  TCP Connections can be upheld in IDLE-Mode for 25 Minutes without causing any traffic.
  • feld 11y ago
    Yes, but this doesn't let your mobile phone's radio sleep and eats excessive battery.
    • blueflow 11y ago
      When the radio sleeps, how should the Phone notice the push? How do you think Apple's push works? Edit: Apple's APN also uses TCP.