I wonder if this addresses your problem...
Why are you blocking my mail?
Short answer: We are not blocking your mail. The administrator of the recipient server is blocking your mail.
Long answer: SpamEatingMonkey.com offers reputation information based on mail received by spamtraps and reported by users. If a domain or IP is frequently associated with spam or other unwanted mail, the reputation score is lowered. If the reputation score falls to low it will be listed in our lists such as SEM-BLACK and SEM-URI. Users of this service are then allowed to take action at their discretion, which may include blocking. To reiterate, SpamEatingMonkey.com is not implementing a blocking mechanism. It is the administrator of the recipient's mail server.
Who is running Spam Eating Monkey? You, or somebody a level above you in the email chain?
