Setting up IP restrictions for ExchangeDefender | ExchangeDefender [ Skip to content ](#main) [ ![ExchangeDefender](/assets/images/xd_logo_blue.png) ](/) Email Security ![Platform Overview](/assets/images/m-xd-pro.png)### ExchangeDefender PRO Enterprise-grade email security made simple for every business. 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We encourage all customers to configure IP restrictions because spammers and hackers should not be allowed to connect to your server directly without going through us. As a matter of fact, nearly all direct server SMTP connections after the MX records have been switched over to ExchangeDefender should be considered as hostile. Hackers and worms often scan entire networks to find vulnerable mail servers to be exploited. By only allowing access to the ExchangeDefender network you can reduce your exposure of critical services on the Internet. This guide applies to Microsoft Exchange 2003 which is also a part of Microsoft Small Business Server 2003. To get started login as the Administrator and click on **Start > All Programs > Microsoft Exchange > System Manager**. You will see the Exchange System Manager screen shown below. Please expand the **Servers** folder, expand **Your server** folder, expand **Protocols** folder, **SMTP** folder and finally *right-click* on the **Default SMTP Virtual Server** and select properties\*\*.\*\* ![Xdr-step1](http://www.ownwebnow.com/blog/media/xdr_2Dstep1.png) Click on the **Access** tab and then on the **Connection** button. This is where you will setup your IP restrictions. Note: You can also setup IP restrictions on your firewall. ![Xdr-step2](http://www.ownwebnow.com/blog/media/xdr_2Dstep2.png) Select **Only the list below** to restrict access to your SMTP server to ExchangeDefender networks only. Click on **Add** to start adding IP address ranges. ![Xdr-step3](http://www.ownwebnow.com/blog/media/xdr_2Dstep3.png) Select **Group of Computers** radio button and type in the subnet address and the subnet mask. There are several: > 65.99.192.0 / 255.255.255.0 65.99.255.0 / 255.255.255.0 64.182.164.0 / 255.255.255.0 64.182.133.0 / 255.255.255.0 70.84.106.0 /255.255.255.0 72.29.99.0 / 255.255.255.0 216.123.109.0 / 255.255.255.0 64.182.140.0 / 255.255.255.0 64.182.139.0 / 255.255.255.0 ![Xdr-step4](http://www.ownwebnow.com/blog/media/xdr_2Dstep4.png) After you have entered all the IP address ranges click on **Ok**. Click on **Apply**. ![Xdr-step5](http://www.ownwebnow.com/blog/media/xdr_2Dstep5.png) That is all! If you have any questions or if you would like us to assist you in the process described above please open up a support request at [https://support.ownwebnow.com](https://support.ownwebnow.com/) or just give us a call at (877) 546–0316 [ Previous post ExchangeDefender LiveArchive launches on Monday! August 2, 2007 ](https://www-preview.exchangedefender.com/blog/2007/08/exchangedefender-livearchive-launches-on-monday) [ Next post ExchangeDefender v3.1 Live August 6, 2007 ](https://www-preview.exchangedefender.com/blog/2007/08/exchangedefender-v31-live) Related Posts ------------- [ ![](https://storage.services.exchangedefender.network/exchangedefender-blog/blog/2026/04/xd10.png) 2 Apr ](https://www-preview.exchangedefender.com/blog/2026/04/announcing-exchangedefender-10)### [Announcing ExchangeDefender 10](https://www-preview.exchangedefender.com/blog/2026/04/announcing-exchangedefender-10) [Read more: Announcing ExchangeDefender 10](https://www-preview.exchangedefender.com/blog/2026/04/announcing-exchangedefender-10) [ ![](https://storage.services.exchangedefender.network/exchangedefender-blog/blog/2025/09/Top-7-IT-Solutions-Every-Small-Business-Needs-in-2025.jpg) 30 Sep ](https://www-preview.exchangedefender.com/blog/2025/09/top-7-it-solutions-every-small-business-needs-in-2025)### [Top 7 IT Solutions Every Small Business Needs in 2025](https://www-preview.exchangedefender.com/blog/2025/09/top-7-it-solutions-every-small-business-needs-in-2025) [Read more: Top 7 IT Solutions Every Small Business Needs in 2025](https://www-preview.exchangedefender.com/blog/2025/09/top-7-it-solutions-every-small-business-needs-in-2025) [ ![](https://storage.services.exchangedefender.network/exchangedefender-blog/blog/2025/09/Website-Active-Image-10.jpg) 23 Sep ](https://www-preview.exchangedefender.com/blog/2025/09/exchangedefender-rolls-out-advanced-reject-policies-for-safer-inboxes)### [ExchangeDefender Rolls Out Advanced 'Reject Policies' for Safer Inboxes](https://www-preview.exchangedefender.com/blog/2025/09/exchangedefender-rolls-out-advanced-reject-policies-for-safer-inboxes) [Read more: ExchangeDefender Rolls Out Advanced 'Reject Policies' for Safer Inboxes](https://www-preview.exchangedefender.com/blog/2025/09/exchangedefender-rolls-out-advanced-reject-policies-for-safer-inboxes) Search the blog Search Recent Posts ------------ - [ExchangeDefender New UI is Live](https://www-preview.exchangedefender.com/blog/2026/05/exchangedefender-new-ui-is-live) - [Announcing ExchangeDefender 10](https://www-preview.exchangedefender.com/blog/2026/04/announcing-exchangedefender-10) - [Merry Christmas](https://www-preview.exchangedefender.com/blog/2025/12/merry-christmas) - [Why IoT Devices Are a Hidden Security Risk for Your Business](https://www-preview.exchangedefender.com/blog/2025/11/why-iot-devices-are-a-hidden-security-risk-for-your-business) - [Top 5 IT Problems Small Businesses Face in 2025 — and How to Fix Them](https://www-preview.exchangedefender.com/blog/2025/10/top-5-it-problems-small-businesses-face-in-2025-and-how-to-fix-them) Categories ---------- - [Archiving](https://www-preview.exchangedefender.com/blog?category=archiving) (21) - [Business Continuity](https://www-preview.exchangedefender.com/blog?category=business-continuity) (13) - [Compliance](https://www-preview.exchangedefender.com/blog?category=compliance) (8) - 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