Delayed e-mail pushing

[scarbone3]

I've got my work e-mail on my phone using IMAP settings. I've got the data push checked for this particular e-mail account. They come in late. I'll be sitting at my computer, and I'll get an e-mail in Outlook. I will not receive it on my phone for a minimum of 15 minutes or it has been up to 3 hours.

Let me know if I am missing a setting.

Thanks