[Mimedefang] Many many MX records

[WBrown at e1b.org]

Today I saw an email flood that was sending to our mail filter and 
directly to the mail server.  Both have MX records for the domain, with 
the filter just having a lower preference value.  The traffic was coming 
from a number of cable modem sites.  MD was successfully tempfailiing it 
and it never seemed to retry.  The flood almost looked like they were just 
picking an MX record without regard for preference.  Adding a firewall 
rule to block access directly to the mail server stopped the flood going 
to it.  I did not get a report from the firewall guy on how much it was 
getting triggered. 

This led me to wonder  what would happen if I registered a bunch of high 
valued MX records, ie:

Domain.com      IN MX 10        mailfilter.domain.com

Domain.com      IN MX 100       bogusaddress.domain.com
Domain.com      IN MX 100       bogusaddress.domain.com
Domain.com      IN MX 101       bogusaddress.domain.com
Domain.com      IN MX 102       bogusaddress.domain.com
Domain.com      IN MX 103       bogusaddress.domain.com
Domain.com      IN MX 104       bogusaddress.domain.com
                .
                .
                .
Domain.com      IN MX 196       bogusaddress.domain.com
Domain.com      IN MX 197       bogusaddress.domain.com
Domain.com      IN MX 198       bogusaddress.domain.com
Domain.com      IN MX 199       bogusaddress.domain.com
Domain.com      IN MX 200       bogusaddress.domain.com

bogusaddress.domain.com IN A 127.0.0.1   ; or some other totally bogus 
address

Legitimate mail servers would clearly try for the low valued MX record. 
Would this fool some of the ratware?  Would I get only a small fraction of 
the junk going to my servers?