I've been involved in an ongoing attempt to remove 3 particular ranges (equating to a /24) from SORB's DB for nearly 3 months now. Here's what I've found. If you get impatient waiting for them to respond to you (over 3 weeks usually), they put your original query to the back of the queue. When they finally do get to it they make silly excuses why they wont act on your request. This means you have to resubmit the request, waiting a further 3 weeks. (As Tony said, they expect you to screw around with ARP records, TTL's, etc to "prove" that you're legit.) This scenario loops several times until they realise you aren't going to just leave them alone to act out IRL RPG's in their office with their sisters clothes. They eventually indicate that they will process the delisting, so you slump back in your chair in relief, and then realise a week later that they still haven't done jacksh.. Sorbs ARE in bed with Satan (snuggled up next to Spamcop), and it's easier to just contact the admin's of the blocking MTA, and explain why their filtering setup is bad.. at least there's a slight chance they'll listen. Jeremy