smtp app for Exchange - handle 2000 emails on client.send?

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Hello,

My company will be hosting a webcast, and I need to send out 2000 individual
emails to people who signed up (for login information...). I created an smtp
app that I can loop through which uses smtp and our Exchange mail server.
The smtp app works fine. I tested it on 10 test emails and called
Client.Send 10 times. The emails went through (I emailed myself).

My question is if anyone knows if Exchange server would be bogged down if I
called client.send 2000 times all at once -- or should I stagger the emails
300-500 milliseconds apart? or maybe loop through secctions of 100 emails
wait a minute, then next hundred...

Any suggestions appreciated.

Thanks,
Rich