[Mimedefang] Only MX record is fake

[Kris Deugau]

kd6lvw at yahoo.com wrote:
> Any spammer stupid enough to try to send his spew forging this host
> name as the sender address will also face an SPF-RR "v=spf1 -all"
> (while those idiots still resolving ONLY TXT-RRs for SPF will get
> "v=spf1 +all").

Some <ahem> "idiots" are still using DNS infrastructure that does not 
support the formal SPF RR type.

The current stock BIND package on RHEL5 (and any of the source-rebuild 
derivatives), for instance...

-kgd