Wietse:
> Tricks with MX-priority spamtraps share the problem that they make
> assumptions about the behavior of all legitimate MTAs.
> For a related approach, see, for example, "nolisting".
Daniel Miller:
> Do I infer from that MX-priority spamtraps are a Bad Idea - at least in
> the real world? This is the first time in about...I think 6 months
> since I implemented the tarpit that I found a problem.
Assumptions about the behavior of remote clients are just that,
assumptions. They can be wrong. postscreen is based on the assumption
that legitimate MTAs will never make certain mistakes such as talking
too soon. Sofar that turns out to be correct for legitimate MTAs.
It has, however, exposed broken non-MTA software such as health
checkers and address verifiers.
Wietse
