Reverse dns - Windows server 2003 standard edition

How to setup reverse dns

[jcodemasters]

Hello,
I have got question regarding to setting up reverse dns.. We are runing a web server and have 15 websites on our server. now a days we are getting large spam.. we have setup declude on smarter mail.. to stop spam mails.. but declude was not able stop spam. in short we got email from declude that we need to setup reverse dns.. i dont know how to setup it.. but as far as i know it requires IP addresses.. we already have.. can any one suggest me how to setup it. We are using plesk 7.6.1

Thanks

[youfoundjake]

JCode, you may want to try this.
[support.microsoft.com...]

[youfoundjake]

err... that should read
[support.microsoft.com...]

[jcodemasters]

just dig out and found on dnsstuff that i am doing mistake my reverse dns pointer should point to my mail server's primary dns..