Milter-greylist

here are some features I think would be nice to add one day in a release 
of milter-greylist:

- sender MX validity : the idea is to able to identify sender domains 
whose MX is "bad", ie points to at least one IP pertaining to an 
IANA-reserved block : loopback, private use, multicast, broadcast, 
testing, link-local, and so on (see http://www.faqs.org/rfcs/rfc3330.html).
Care should be taken to account for CNAME nesting (with max recursion 
counter and loop detection), DNS temporary failures, and IPv6 counterparts.
Sendmail 8.14 introduced such feature, but adding it to milter-greylist 
is still interesting because of integration in ACL system.

example of use :

	racl blacklist mx bad msg "invalid sender MX"


- sender MX client matching : the idea is to setup a poor man's SPF 
check for domains who don't publish SPF records, and have the same 
servers for inbound and outbound traffic (a quite common case): if a 
mail from domain foo.bar comes from an IP which is listed as MX for 
foo.bar, then we can quite trust it and skip greylisting. An example of 
use :

	racl whitelist mx match


Of course above examples are only suggestions, the actual syntax may differ.

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