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- # [Hostnames to tarpit]
- #
- # Description: "Slow down connections from these Internet hostnames"
- # Keywords: "tarpit, delay, slow, hostnames"
- # Category: "Counter measures"
- # Format: "edit text"
- #
- # Sets the domain names of the hosts which should have their mail
- # connections slowed down through "tarpitting".
- #
- # Tarpitting is a technique which aims to discourage people who send junk
- # mail from sending it to you. Here is how the argument goes: if junk
- # mailers have their messages refused right away, then they lose very little
- # by trying to send to you in the future, because they will know right away
- # if the mail will not be accepted, and thus can continue sending. However,
- # if it takes a long time for the junk mailer to be told that their message
- # is being refused, then their mail sending will be slower, and they will
- # have an incentive for removing you from their junk mail list. This
- # technique is called "tarpitting" because it gets the junk mailers "stuck"
- # in a "pit of tar" where it is difficult for them to get out and move
- # quickly. The analogy being that animals who get stuck in tar learn to
- # avoid it in the future.
- #
- # Whether tarpitting works in the real world is not known, as there is very
- # little information available about the junk mailer's practices.
- #
- # Given that most junk mail is not delivered by the originator, but by some
- # relay host, in most cases the junk mailer will never be aware of the
- # tarpitting. But, perhaps the relay host will then be more motivated to
- # secure their mail servers so that they cannot be used as unauthorized
- # relay hosts.
- #
- # The problem with the theory of tarpitting is that it assumes that the mail
- # server will notice the tarpitting. We are not aware of any mail
- # server performance analysis programs which indicate to the sender that
- # something like tarpitting is going on.
- #
- # You define hostname patterns for any host that might connect to you. You
- # can repeat the commands if you need to define multiple hosts.
- #
- # For example, if you wanted to tarpit all mail from "junkmail.com", you
- # would specify:
- #
- # > junkmail.com
- #
- # Instructions: "Please enter all hostname to tarpit below, in lower case."
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