Hi Everyone, The problem: I freelance Sys admin for quite a few small businesse's, Using Ms Small Business Server 2000. One of my clients needs to send out large e-mail shots 50 to 100,000 e-mails (not spam but genuine offers to thier customers). The problem seems to be caused by duff e-mail addresse's within thier mailing lists. mail goes out ok but as to be expected duff addresse's get returned ,wherby the server tries to re-submitt these duff addresesse's. This is causing the following problem: Urgent/everday e-mail is being seriously delayed eg. sitting in the que behind the mail waiting to be re-submitted. Re setting mail priorities and delivery timeouts does not seem to help and short of deleting the mail que, I havent managed to resolve this problem. Any advice or help would be much appreciated, I have had a good look at the archives but have not found anything that seems to address this problem. In anticipation. Best regards. Rick Parsons rick@xxxxxxxxxxxxxxxxxx As a footnote: When the que is finally completed mail delivery reverts back to normal and all is well. Info: all mail is sent using DNS/SMTP directly, dns is working fine.