Milter-greylist

Gentlemen,
I'd like to return to the SPF issue.

Currently, this filter uses "SPF pass" condition is a reason to
*allow* submission.

As I demonstrated in one of my previous messages, this is not in line
with the concept of SPF, and opens a potential hole for spammers.

Still SPF information can be used in a meaningful way: the filter
should ignore "SPF pass" (and greylist in a usual way), but honor "SPF
fail" and *block* the submission with 5xx code.

What do you think?

Eugene