I registered yesterday for 5 departures sites and I recieved a reply from BWI/PAX that included a copy of the registration request from Processor-C3@takeahop.org. That message shows that the registration was sent to BWI, McQuire, Andrews and Norfolk, but does not list Dover which was first choice. Is this a problem? 
Checked with Dover AFB today and they said I was in the computer so I guess the system worked Checked with Dover AFB today and they said I was in the computer so I guess the system worked
I also reviewed the server code for that type of issue and couldn't duplicate the symptom. So, as you said, I think everything worked fine. (I think somehow their e-mail application stripped out one of the addresses on their internal version.)