On Tuesday, March 09, 2004 02:49 pm, Brian Densmore wrote: > What do you mean you had to unblock RDNS per your ISP's policies?   It was that or hack sendmail to return a 5xx bounce code instead of a 4xx, and my sendmail book is in England. They accept the mail for valid reasons of their own, I want it auto-forwarded to my server, and if I bounce it with a 4xx code it gets stuck in their queue.