Really? That's odd.... I e-mailed him right before I posted on here, and it went through just fine. (Just checking, but you did replace the {at} and {dot} with @ and . correct?)
This is a copy and paste from my e-mail:
garyo@northernengineering.com
Didn't want to post this like this, as the metabots will find it, but oh well. If this doesn't work, you might want to hop on the Yahoo! message board and post your RSVP there, just in case, although I doubt he'll have any trouble fitting in one extra car.