This is directly off the rfc-ignorant.org site. So it is OK to reject/block email to the postmaster as long as the following is applied.
---- After careful consideration, there seemed to be a consensus among users that use of blacklists, etc., did not meet the "narrowly tailored" requirements for blocking mail to postmaster, but that it would be undesirable to list sites simply for employing the MAPS RBL and such on their postmaster address. It was decided that we wouldn't list folks if the rejection message for postmaster seemed to indicate the reason for denial ("{ip} rejected as listed on the MAPS RBL", etc.) ---- Full text at http://www.rfc-ignorant.org/policy-postmaster.php
Here, they are essentially saying "You can block likely spam to postmaster@ *if* the sender is notified of why the E-mail is blocked."
I think mail servers should spam scan these emails and delete or hold the messaages and possible send a message back with why the message was not delivered. If some one really has an issue with mail delivery do a whois and pick up the phone and call, if that number is invalid then??????
This is a different issue. The problems here are that [1] The sender will never know that their E-mail didn't get read, and [2] The sender will never know why their E-mail didn't get read. Bounce messages are a bad thing, simply because they will cause a lot of spam to spread.
I remember back in the days where spammers had a very little bit of courtesy, and would never ever E-mail postmaster@ accounts, and would never ever E-mail .org E-mail addresses.
-Scott
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