Sequence Diagram I for First Pass

This is a sequence diagram (1 of 3) that covers most of the UCs in the first pass. Sequence diagrams are useful for looking at the relationships between different classes in the system within particular Use Cases or scenarios. They are pretty straight forward and I find them pretty useful.

I've introduced a concept of "Real Event" which I dive into a little more deeply in the class diagrams. I've also opened up the email subsystem and introduce concepts like email templates, pending emails, and an email service. It is my intention to look at send and mimemail as solutions in these areas.