I'm not sure if they're using Goodmail Systems software now or not. If they are not yet using it, Yahoo's anti-spam thing works by IP address and voting. If mail from a particular IP address gets enough "spam" votes, it's blocked for a while. I guess the way to circumvent this would be to send from a number of IP addresses. I'm not sure how the Goodmail Systems software works. Good luck! --- http://www.outformations.com/~dek wrote: > Hey Robert, > Do you know much about the technology behind Yahoo SpamGuard? I have a > client that wants to send a single solicited email to a group people, but > it is sometimes getting blocked by SpamGuard. Any advice on how to get > through? > > Cheers, > Dale Kiefling > Outformations, Inc. > 415 699-0421