Hey April, if you still haven't received an email, there are a few things you should check out. First, check in the top left corner of your Marketo instance. There may be an icon indicating any available notifications documenting errors in smart lists/campaigns which would have caused emails to misfire or not send at all. Next, click on the smart campaign, and open the tab "Run History." This should show whether the run that you did completed, and how many leads qualified for the email. And third check the results tab. This should show to whom the email was sent.
Also depending on the content of the email, particularly if it was just a test, your email may have gotten caught up in a spam filter. Hope that helps.