When I am trying to send emails on my Ymail it keeps blocking them impeding it to be sent? Why is that?

I am really up sad with Ymail. My husband has Yahoo and says he never had the problems I am having when trying to send emails, my Ymail (both account) keeps blocking me with word verifications and them for a long period of time in a day and ends up not sending ny emails at all, just keeps coming a message- RETURN TO THE MESSAGE, I am so disappointed with Ymail, as I need to work with it, I am seriously thinking about to go back to hotmail or open a ME or MAC account :(