Hi Anabel, and welcome to englishforums.
I'm afraid most members here are not willing to correct essays sent by email, or any other material that isn't posted here. In fact, some mod will probably edit your post to remove your email address, since email addresses should only be written in your profile. You can write it there so that the the other members will know how to contact you.
If you don't want your essays to appear on the net, you could post them here to get help, and then when you are done, ask an administrator to delete the threads you don't want to be around. The only problem would be that even if they aren't posted here anymore, they'll remain in Google's cache for a while (I don't know how long).
Some mod or admin will definitely show up and tell you more on what to do.
