SMTP Domain Name Unknown

[news-read.fnsi.net]

I'm having a problem sending to certain domains that check for my domain.
I get the mail bounce with error..  Domain Name Unknown

I'm running  named 8.2.2-P5NT for Win32
what am i doing wrong?

thx in advance

-Doug

my dns config files are as follows

*********************************************
named.boot
*********************************************
primary 0.0.127.IN-ADDR.ARPA db.127.0.0
primary grobsystems.com db.zoneinfo
primary 20.115.209.in-addr.arpa  db.inaddr

cache . db.cache
*********************************************
db.127.0.0
*********************************************
@ IN SOA ns.grobsystems.com. postmaster.grobsystems.com. (
  2000060103 ; serial number in YYYYMMDDxx format
  3600  ; refresh interval for slave ns to refresh from master
  1800  ; retry by slave ns if master ns is unreachable
  864000  ; expire from slave cache when master ns is unreachable for this
period
  86400   ; default time-to-live in any DNS cache
  )
;nameservers
@ IN NS ns.grobsystems.com.
;
1 IN PTR localhost

********************************************
db.209.115.20.2
*******************************************
@ IN SOA ns.grobsystems.com. postmaster.grobsystems.com. (
  2000060103 ; serial number in YYYYMMDDxx format
  3600  ; refresh interval for slave ns to refresh from master
  1800  ; retry by slave ns if master ns is unreachable
  864000  ; expire from slave cache when master ns is unreachable for this
period
  86400   ; default time-to-live in any DNS cache
  )
;nameservers
@ IN NS ns.grobsystems.com.
@ IN NS splicekit.fibernet.net.
@ IN NS optical.fibernet.net.
@ IN NS kevlar.fibernet.net.
;
$ORIGIN 20.115.209.IN-ADDR.ARPA.
2     IN  PTR    ns.grobsystems.com.
3     IN  PTR    grob3.grobsystems.com.
4     IN  PTR    grob4.grobsystems.com.
5     IN  PTR    grob5.grobsystems.com.
....
127 IN  PTR    grob127.grobsystems.com.

*********************************************
db.grobsystems.com
*********************************************
@ IN SOA ns.grobsystems.com. postmaster.grobsystems.com.com. (
  2000060103 ; serial number in YYYYMMDDxx format
  3600  ; refresh interval for slave ns to refresh from master
  1800  ; retry by slave ns if master ns is unreachable
  864000  ; expire from slave cache when master ns is unreachable for this
period
  86400   ; default time-to-live in any DNS cache
  )
;
;nameservers
@    IN NS ns.grobsystems.com.
@    IN NS splicekit.fibernet.net.
@    IN NS optical.fibernet.net.
@    IN NS kevlar.fibernet.net.
;mail
@    IN MX 10 grob100.grobsystems.com.
;
@    IN A 209.115.20.2
mail    IN A 209.115.20.100
smtp    IN A 209.115.20.100
pop    IN A 209.115.20.100
www    IN A 209.115.20.100
ftp    IN A 209.115.20.100
;

ns           IN      A       209.115.20.2
grob3        IN  A 209.115.20.3
grob4      IN  A       209.115.20.4
grob5        IN  A       209.115.20.5
....
grob127        IN  A       209.115.20.127