How do I view emails that have already been sent?

@Brian Riback
from the calendar you can click on the email you want to review, and click the “Review” link.

This will not take you directly to the email, but it will take you into the campaign (assuming you don't know your campaign that the email message is in, if you do know the campaign, you just need to go to the campaign directly).

Then while noting the name of the message, click on the Message tab and search / locate the message, and click on Preview to see the email content that was sent.