Gmail won't send on iPhone 4S/iOS 7.1

Just got a new iPhone and had problems connecting to Gmail. Someone here helped me out and got that problem fixed. Now it won't send. I get the message:

"Unable to send Email"

"A copy has been placed in your Outbox. The sender address "myemail@gmail.com" was rejected by the server."

So I have four emails in my outbox that I can't delete, and they won't send. I can receive email on the phone. I can send and receive email on my iPad and one my computer. So it is a setting in this phone that isn't configured right.

Any ideas? Thanks in advance.