From: "Seth Goodman" <sethg(_at_)GoodmanAssociates(_dot_)com>
Sent: Wed, 7 Sep 2005 15:38:49 -0500 (20:38 UTC)
The practical question is how many
hosts that fail FCrDNS but pass a forward lookup on the EHLO FQDN are not
legitimate mailers?
Based on private spam complaints from some users
who procmail using sendmail's "(may be forged)"
indication of this situation, it seems to be
the great majority, at least for emails that we
allow though our gateways which have passed
through all of our checks (including DUL-based
filtering).
Totally non-scientific, but those vocal users report
that they haven't yet quarantined a desired email
as a result of that rule, and are pushing to have
the rule applied globally. I'm still resisting that.
As usual, ymmv.
Len
-------
Sender Policy Framework: http://spf.pobox.com/
Archives at http://archives.listbox.com/spf-discuss/current/
To unsubscribe, change your address, or temporarily deactivate your
subscription,
please go to
http://v2.listbox.com/member/?listname=spf-discuss(_at_)v2(_dot_)listbox(_dot_)com