I have a Mac Pro and an iPad and an iPhone. I can send and receive emails from my gmail account; however, I have a second account and I can receive emails on all 3 devices, but NOT send any emails on this second account on the iPhone or the iPad

cannot send emails on the second account on iPad and iPhone, yet I can on the Mac Pro

Hello Maria,
Most issues with Mail on your iOS devices can be resolved by following the steps in the article below. For your specific issue, you may need to remove the account and add them back in. 
Get help with Mail on iPhone, iPad, and iPod touch
http://support.apple.com/en-us/TS3899
Regards,
-Norm G. 

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