For several months our users have no luck in sending email to Yahoo subscribers. CBL and Spamhaus do not have me listed. However, before all this happened, I caught a PC using our smtp server. It was a donated PC from a major corporation. Anyway, this PC has since been trashed. But due to that incident we did become listed. I did manage to get us delisted, but yahoo never complied it seems. I am not at all sure that yahoo's resistance is related this this incident which is why am I looking for a resolution of some sort. The brass is beating at my door.