Client host rejected: Please do not SPAM, use your official mailgateway

Get this message from one of my users who tried to e-mail some one

Client host rejected: Please do not SPAM, use your official mailgateway>

i have read post posts on the is subject about it being a reverse lookup problem.

But i dont know where to start

here is how every thing is set up

I have a mail server and a file server

Mail server on
file server on
Gateway on

Out side Leased line through firwall

The mail server is configured to
This Email address is only used if the main mail server in Houston fails.(we are in the UK)
We all have mail boxes in Houston that are forwared to our mail server the address being
Houston mail server is configured to
We send by default smtp mail  on (our Uk server) from the address

did a nslookup

Default server points to file server with correct lan ip address

set type = ptr
Inputted Internet ip address
Got Non-authortive answer     name =

All the names and numbers have been made up

how do i set up my reverse look ups and where

Thanks in advance Mark
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Mob-bomConnect With a Mentor Commented:
the reverse dns needs to be on the ip that is sending the email, most likely the ip address after your firewall
Reverse DNS is done on your PTR records.  Place the reverse entry in your A record of your zonefile: 1 PTR

Whoever handles your dns records can do this for you.  Its a common request.  

ellandrdAuthor Commented:
I have looked in DNS

ANd in the reverse lookup zones there is one folder called

192.168.1.x subnet all ptr records for all computers are there including the mail server or am i missing some thing
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ellandrdAuthor Commented:
so from the example above needs a ptr records
most likely.  who handles your dns server(s)?  They should be able to do this for you easily.
ellandrdAuthor Commented:
He is holiday for 2 weeks that why i ask
:(  That is what needs to be done.  
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