I have some fairly popular echoes at gurus.com, the most popular of which is [EMAIL PROTECTED] (an address that never appeared anywhere, oddly enough, although versions like [EMAIL PROTECTED] appear in my books.)
It remembers each message it sends, and won't send more than five messages per hour to any target mailbox. Messages above that are dropped, not delayed. I don't ever recall a deliberate mailbomb, but I do get spam blasts that would reverse mailbomb the forged From: address in the spam, and the occasional loop. The rate limit has sufficed to keep things under control. Regards, John Levine, [EMAIL PROTECTED], Primary Perpetrator of "The Internet for Dummies", Information Superhighwayman wanna-be, http://iecc.com/johnl, Sewer Commissioner "Just how much hay did we buy?" asked Tom, balefully.