like you have said you checked and you are listed. It will tell you on what servers you are listed and procedure to remove on their website.

but before you do that you need to found out why you have been listed in the first instance. i would run checks on the server or all the computers that are connected as there is bound to be some account which is being compromised.

I would also change the users and servers passwords to be on safe side

ok i see.

how can i check the sbs 2003 if it is being used as spam server

any software that i can run

i just checked for open relay and its clear.

      Test      Result      Hide
      SMTP Reverse Banner Check      Reverse DNS FAILED! This is a problem..      Ignore
      SMTP TLS      Warning - Does not support TLS.      Ignore
      SMTP Connection Time      0.265 seconds - Good on Connection time      
      SMTP Open Relay      OK - Not an open relay.      
      SMTP Transaction Time      5.944 seconds - Warning on Transaction Time      Ignore

however reverse dns failed. could this be the problem?

its throwin dns error on dnnstuff mailserver test

how di setup ptr, is that on the sbs server or isp side domain

What ISP? Cable, DSL, T1?

its a broadband line with static ip.

the domain i.e. whatever.co.uk has an mx record setup pointing to the static ip

so mail server. is mail.whatever.co.uk

how do I setup a PTR?

You can ask them to set one up for you especially if they are managing your DNS. Contact support and ask for a PTR record for your mail server IP that points to the FQDN (mail.whatever.co.uk)

I asked my provider and they said we don't do PTR

Maybe it's called cname and I'm Using the wrong name which they are not familiar with.

There not too clued up these support people.

I have setup an MX record , I guess that's not the same as PTR

The PTR is entered by the owner of the IP block or they have to specify a DNS server forward the request to.