How to send email from heavy traffic site in asp.net

 Hi Experts,
My question is today, i have a web system. its every we need send more than 1000 emails to system users and for their activity. its must we need send from asp.net  application. so i have written common class to send email its worjing well. but when i'm use without thread it take time to  send email adn re direct to thier pages. but after that i  try  use this


ThreadPool.QueueUserWorkItem(delegate { SendEmail(emailto, subjecttext, bodyText, IsHtmlFormat, CCEmails, BccEmails, enumSenderFrom, hasLogo); });
Its now workign well, but i have read some articles ThreadPool.QueueUserWorkItem is not good when site get heavy traffic. so  what is best way to do i'm expecting expert comments to this
Here :http://madskristensen.net/post/Done28099t-use-the-ThreadPool-in-ASPNET.aspx


thank you


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