Translation of inefficient in Spanish

Are you a man or a woman? You have no picture in your profile, and I do not know whether the user name loli2938 belongs to a man or a woman, but actually it does not matter to me. I am here for the Spanish.
Everything in your letter is perfect! Almost no errors and the writing style, very impressive! After this first year in England, you have also improved your vocabulary and the grammar skills.
Please send me your email address again because the message got into the Junk Mail filter and I've accidentally deleted it. As soon as you resend it please contact me again here on this site.