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You need to look for 3rd party tool if you are ISP is not providing. You can look out products like MessageLabs to help you for that.
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You need to look for 3rd party tool if you are ISP is not providing. You can look out products like MessageLabs to help you for that.

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Go into Exchange System Manager, expand Administrative Groups - SITE(specific to your org) - Servers - ServerName(specific to your org) &nbsp;- Protocols - SMTP<br />
Right click on Defauly SMTP Virtual Server and choose Properties.<br />
Choose the Access Tab.<br />
Click on Connection.<br />
Add your IP with Subnet that was provided by MimeSweeper.<br />
Also add your private IP network, just in case...<br />
Hit OK until you are out of the properties. Now you will only accept mail from those locations.
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Go into Exchange System Manager, expand Administrative Groups - SITE(specific to your org) - Servers - ServerName(specific to your org)  - Protocols - SMTP
Right click on Defauly SMTP Virtual Server and choose Properties.
Choose the Access Tab.
Click on Connection.
Add your IP with Subnet that was provided by MimeSweeper.
Also add your private IP network, just in case...
Hit OK until you are out of the properties. Now you will only accept mail from those locations.

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By the way - I use Postini for my mail filtering and it works great. 
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By the way - I use Postini for my mail filtering and it works great.

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Hmm. It doesn't appear to allow an IP Range, only individual addresses. Am I able to allow a range?
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Hmm. It doesn't appear to allow an IP Range, only individual addresses. Am I able to allow a range?

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Thanks for helping a novice. Great response and correct answers. The solution would probably have been easier to understand if I wasn't a novice. Thanks
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Thanks for helping a novice. Great response and correct answers. The solution would probably have been easier to understand if I wasn't a novice. Thanks

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We have decided to use a Mail Laundry service from MIMESweeper. I have been given an IP address range that mail from MIMESweeper will use. How do I configure Exchange 2003 to except mails from and IP range?
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We have decided to use a Mail Laundry service from MIMESweeper. I have been given an IP address range that mail from MIMESweeper will use. How do I configure Exchange 2003 to except mails from and IP range?

Receive e-mail from a select range of IP addresses

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.