Why is my htc desire 6 not sending emails

[AC Question]

No emails are being sent On my yahoo account. They keep coming up resend but they don't resend.

 

[B. Diddy]

Welcome to Android Central! Which Desire model is it? "6" isn't a valid model. Are you using the stock Email app, the Yahoo Mail app, or something else? Are you receiving mail in your Yahoo account?