North American Network Operators Group
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Re: incorrect spam setups cause spool messes on forwarders

  • From: Michael Lewinski
  • Date: Mon Dec 01 14:59:12 2003 
On Dec 1, 2003, at 11:10 AM, Randy Bush wrote:


is the following a general problem, or just one i am seeing?

note 2821 says

      450 Requested mail action not taken: mailbox unavailable
         (e.g., mailbox busy)
      550 Requested action not taken: mailbox unavailable
         (e.g., mailbox not found, no access, or command rejected
         for policy reasons)
FWIW, there are now fake smtp tarpits out there that behave this way (4xx deferrals of suspected spam).

http://www.benzedrine.cx/relaydb.html

The idea is to "punish" spammers by filling up their queues, although honestly I don't know of any spammers who actually *have* queues. They just borrow other people's of course. I'm not sold on the wisdom of this course.