Microsoft Mail Wont send my emails?

so I have been sending emails and I can't find them anywhere, I looked in every category sent, drafts etc.. and i never receive any error or warnings. I failed a subject because of this, Mirosoft application are becoming unreliable.even when you look online you can never find the answer for this, they give you instructions like you never used a mail before.I think my question is clear, I don't need to explain.