When sending email it responds to type in special characters.

when i finish typing my email i hit send.it says input special characters.i type in the special characters.it says ok and go back and send my email.i only see 1 way to go back and that is click on the top left arrow.then it says what i type as special characters is wrong.so iget in a vicious cycle.so how do i go back and send my email without getting this error? Also,why do i have to get this stupid message to type in special characters every time i want to send an email?