Do we have any WG list mgmt guidelines saying we cannot automatically
discard/reject e-mails from non-subscribers?
http://www.ietf.cnri.reston.va.us/IESG/STATEMENTS/mail-submit-policy.txt
But I'll note that we aren't following it to the letter anymore. I
think that there are plenty of mailing lists that send spam without
warning or human review to /dev/null. Some will argue that there is a
fine line between "spam" and mail from a non-subscriber.
But, with spam getting worse and worse, asking anyone to look at every
spam message manually is asking a lot.
there's a third alternative, which has been suggested on the wgchairs list:
running a script that uses spamassassin to evaluate the spamminess of the
stuck messages.