Upgraded to 6.1.2 last night and now my mail is crashing... can anyone help?

Close the Mail app in the Task Bar and re-launch.

Double-click the Home button to reveal Task Bar. Hold Mail app down for a second or two; tap the minus sign to close app.

If it still doesn't work, try a reset.

Hold the Sleep and Home button down (together) for about 10 seconds until you see the Apple logo.

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