My iPhone 4 won't push email.

My 3gs is doing the same thing. Didn't do it till i upgraded to ios4. So in the same boat as you..

I am having the same problem. I have to launch the e-mail app. before any messages come through.

You guys do realize that Gmail, Yahoo, etc. use IMAP/POP which is a Fetch/Pull technology and DOES NOT support pushing. This is why you are not getting email pushed to your phone.

THE ONLY WAY OF GETTING PUSH EMAIL IS:
1. MobileME
2. Microsoft Exchange Server using ActiveSync

If you want true push Gmail you need to do the following:

http://www.google.com/support/mobile/bin/answer.py?answer=138740&topic=14252

1 Create a new email account
2 DO NOT select GMAIL, instead select Microsoft Exchange from the list of mail services
3. Enter your email address
4. Enter your username and password
5. The server is m.google.com
6. leave the domain field blank
7. once you connect, you will have the option of selecting which services you want pushed to your phone: Mail, Calendar, Contacts. (I use all three!)
*** WARNING! If you turn on Contacts it will delete all contacts on your phone!
8. Now you have push Gmail!

Message was edited by: Christian McDonald

Message was edited by: Christian McDonald

Thank you for the link. It does push the mail now.

http://support.apple.com/kb/HT2625 says Yahoo supports push.

It's not working for me though.

Found this on CNET

Unfortunately, the server-end fixes aren't working for all users, and it appears that some accounts may need a jumpstart in order to start pushing again. Here are some escalating steps for starting the flow:
Navigate to mobile page on a Desktop Log into your Yahoo! email account on a desktop computer. Navigate to "Settings," then "Mobile" then go back to the main page -- you don't need to change any settings. Mail may start pushing right away.
Delete then recreate account Go to the Settings application, tap Mail then tap your Yahoo! account and tap Delete Account. Then go back to the Mail pane of Settings and re-establish your Yahoo! account. You may need to reset your iPhone again after doing this.
Create an all-new account In some cases, the only option is to create an entirely new Yahoo! account at mail.yahoo.com. Some accounts don?t, for whatever reason, appear to be working properly with push services.
Restore iPhone As a last resort: Connect your iPhone to your computer, then in iTunes, select your iPhone and click the Restore button under the Summary tab. Restoring the phone will erase contacts, calendars, photos and other data stored only on the phone, but will restore automatically backed-up information including text messages, notes, call history, contact favorites, sound settings, widget settings, etc.

Thanks for the tip, Christian. My gmail is now pushing!

Also worked for me (deleting and resetting Yahoo! account). Thanks!

Message was edited by: tobiasellier

I have a similar problem with my iPhone 4, but with my company Exchange email. Email won't push to the phone consistently. If the phone sits idle for an extended period of time email stops pushing. To "jump" start it I have to open the mail app and then mail floods in. Any idea what the deal is?

I use Microsoft Exchange. It doesn't push sometimes and pushes at others. Very inconsistent. I'm going to try deleting the account and setting it up again but it's very poor that this happens. I have the iPhone because I can use it so fluidly for mails but I worry that urgent messages don't come through.

I just deleted my yahoo mail account on the iphone because push wasn't worked after I upgraded to 4.01. I delted the account, restarted the phone, setup the account from scratch and now it works perfectly.