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SMTP Communication Problemn 550-5.7.1

We have Ex2k3 server and connected with ADSL line. Our email could not reach to gmail or few more other domains. Following is the error message. I tried restarting router to get a new IP from ISP and since its dynamic most of them are blocked.
We dont have any public IP and our exchange is not live hosted.
Your message did not reach some or all of the intended recipients.

      Subject:      ??: abc ?????
      Sent:      7/17/2008 10:42 AM

The following recipient(s) could not be reached:

      userx - Gmail on 7/17/2008 10:52 AM
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <mail.domainname.com #5.5.0 smtp;550-5.7.1 [] The IP you're using to send mail is not authorized>

How to resolve this issue. Hope you understand the scenario. If yo u need anything else pls let me know.
Email ProtocolsExchange

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8/22/2022 - Mon