Our office has been getting asked this question a lot, from graduate and undergraduate students alike. If you turned your graduation application in to our office, there's a 99.99999879% chance your advisor received it and is in the process of completing it for you before sending it on to graduation services for final processing. We receive several hundred of these forms each spring, and since our goal is to process them in a timely manner, we've decided not to practice sending out confirmation e-mails.
For this reason, among others, we discourage you from slipping your form under our door after hours. Instead, deliver your form by hand or scan/email it directly to your advisor.
On a related note, your graduation application needs to be turned in to the Office of Academic Advising and Student Services, not the Dean's Office.
Tip: If you receive a stand-alone e-mail in late February (and several leading up to May), this is an indication that your application has been processed.