Justin,

I've been running CF with large mailing lists (professional association
memberships, to satisfy the suspicious types) for years, and the load
you are describing is trivial, even for unique messages and even on a
commercial shared server.

Unless you have a dedicated cadre of users whose mail servers refuse
your mail, causing Imail to spin around for ages retrying a significant
percentage of them all.

I wrote a tutorial on one way to throttle down CFMAIL, but it works at
speeds much higher than yours, frankly.  Still, you can use the basic
technique -- coupled to a browser window that must remain open forever
-- to throttle speed into, say, the 600/hour range for a 33% decrease in
speed.  

http://mysecretbase.com/Slowing_Down_CFMAIL.cfm

You can also induce forced waits in execution via tools like cf_wait...
But that will tie up threads ("danger, Will Robinson!").

Bottom line:  If you need less speed than what you are reporting you've
got a serious problem somewhere, and its not your mail volume.

Whats your CF mail spool interval?  Older versions of CF would not allow
less than 15 seconds, I think.  On 6.1 there is no restriction.  Try a
10 second interval in the CF admin to keep the mail from piling up in
the CF mail queue.

Good luck,

--------------------------------------------
 Matt Robertson       [EMAIL PROTECTED] 
 MSB Designs, Inc.  http://mysecretbase.com
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 Site Design and ColdFusion Developer Tools
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