My iphone 4 is not working some time to send out  the email.

There is also not in the " Sent " .
and no one  to receive my email.
my email provider is yahoo.

Hi, Hsuweichih. 
Thank you for visiting Apple Support Communities. 
Here is the best troubleshooting resource when experiencing issues with email on your iOS device. 
iOS: Troubleshooting Mail
http://support.apple.com/kb/ts3899
Cheers,
Jason H. 

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