It has probably happened to you that when trying to send a message in iOS, this one is stuck in the outbox of the email application on your iPhone.
It is easy to see when it happens this inconvenience because at the bottom of the iOS mail application, the status bar shows "1 unsent message" or x unsent messages.
If you find that email that you tried to send remains stuck in the outbox iPhone or iPad, you can use some simple tricks to solve the problem and able to send email.
How to solve the problem of message stuck in the outbox mail for iOS with a reboot
The good news is that even remain stuck emails output tray, they can be unlocked by simply restarting the iPhone, iPad or iPod touch.
The easiest way to force restart an iPhone or iPad is holding the power button and the home button simultaneously until the Apple logo appears on the screen.
Once the iOS device is turned on again, make sure that there is a wi-fi enabled or data connection plan, then reopen the mail application. You should send the message without problems.
Resend the mail stuck in the outbox on iOS
If the email still is stuck after restarting the iPhone, try to resend it. This is easily done by iOS mailbox: