As for iOS client's there are exactly 3 that come to mind. Gmail, Apple Mail and Sparrow (discontinued).
There's a good reason for that- Apple won't let you check a mail server on the client side. So you have to do what Mailbox did and set up huge server infrastructure to check people's e-mail then send push notifications. It makes it a lot more difficult than just making a client app.
There's a good reason for that- Apple won't let you check a mail server on the client side. So you have to do what Mailbox did and set up huge server infrastructure to check people's e-mail then send push notifications. It makes it a lot more difficult than just making a client app.