<p>APDoolittle–</p>
<p>If you feel that an additional essay is necessary (or very helpful) in giving Admissions a complete picture of yourself as an applicant, go ahead and send it. If you want to send one simply to send one, don’t send it.</p>
<p>Now, if you’ve decided to send it, I think regular mail is probably the safest bet. Given that it’s an additional essay, if it gets in a week or two after the deadline, there’s no tragedy–probably Admissions will stick it into your application file without a second thought.</p>