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Hi my name is Fred welcome to Just Answer.I am sorry to hear about the problem you are having today.
It sounds like you are having an issue with your yahoo mail. That must be frustrating.
Sometimes Yahoo mail servers do not work fluidly with the iPhone's built in mail app. A very reliable way to access your Yahoo mail on your iPhone is by using the free Yahoo Mail app for iPhone's. You can get it from the apple app store, here.
Its easy to use. Just download it, install it. And then sign in with your Yahoo email address and password. You will be able to easily send and receive mail that way.
If you have any further questions please feel free to ask, Thank you for using Just Answer.Fred