OS X Daily writes, Mail generally automatically checks itself when launched, or every some-odd amount of minutes based on your Push and Fetch settings. From iOS 6 onward the familiar circle “Refresh” button is gone from the lower left corner though, but that doesn’t mean you can’t forcibly check mail yourself when you want to. To immediately check for new mail right away just tap and hold on any message from the inbox and pull down and then release. You’ll see a little rubber-band style followed by the spinning progress indicator as Mail pings the server to check for new messages....
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