You can forget about WHOIS privacy problems, bulk access, and all the like: Today, you get that information for free, from NSI. They just sent me 1.7MB worth of e-mail addresses. Yes, that’s right: I got a message from email@example.com with the subject “.ORG Domain Name Update” (they are the registrar of record for does-not-exist.org). That message contained about 86,000 e-mail addresses, from R over Z to _. One address per line. Time to do a transfer.
Ross points to another recipient of the message.