Best methods for large To: list using cfmail

I'm getting time-out errors on one of my sites. People can
post to a message "corkboard" and site members can subscribe. One
of the topics has close to 600 subscribers. The SMTP mail server is
IIS's built-in thing, on the same machine as the web server.
I'd like to continue cflooping through the recipient list so
each recipient can get a "Hello Joey, here's an email" at the top
of their email, but I'm thinking that if the list gets to >1000
subscribers I'm going to time-out after a while.
What methods, other than giant BCC lists, are people using
for high-volume emailing? Perhaps just a better SMTP server, or one
on another machine so it's not fighting for processor time with the
webserver itself?
Michael

Matt Woodward has some sample code on his blog to use the
asyncronous event gateway to send email. The post is here :
http://mattwoodward.com/blog/index.cfm?commentID=203
This should take care of your timeout issues...
Ross Valenti
<edited to fix misspelled name >

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