In <792DE28E91F6EA42B4663AE761C41C2A029A1C7A(_at_)cliff(_dot_)bai(_dot_)org>
"Ryan Malayter" <rmalayter(_at_)bai(_dot_)org> writes:
Have you done any reverse DNS or WHOIS on the IP addresses in doing the
DNS requests? Surely they will lead to an MTA, which will most likely
give you the domain names of the people with broken implementations.
Sometimes this works, sometimes it doesn't.
The IP address will come from the name server used by the MTA or spam
filter, which may be little help in tracking down the actual MTA.
(For example, if the IP address resolves to some comcast NS, you
aren't going to be much closer to finding out who has the strange
implementation.)
Of course, listbox doesn't appear to have archives of this list online.
Go to http://spf.pobox.com/mailinglist.html and click on the "archive"
link.
-wayne