Guys,

This is what I've setup:

fauxmx01.plusone.com MX 10 (fake MX, non-responding <network> IP)
nymeta01.plusone.com MX 20 (real MX)
nymeta02.plusone.com MX 20 (real MX)
fauxmx02.plusone.com MX 30 (fake MX, non-responding <broadcast> IP)

This will slow down the "sneak in through the presumably
less-restrictive, lower-priority MX" as well as the "go
straight to the highest-priority MX" direct-to-MXers. And
it uses no IPs, if you use your network and broadcast IPs.
I wonder if this can be used in place of greylisting...

We'll see how it works.

---
Chris Covington
IT
Plus One Health Management
75 Maiden Lane Suite 801
NY, NY 10038
646-312-6269
http://www.plusoneactive.com