IP Restrictions and You | 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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But in the odd chance that they are or have direct access to them, I’m going to touch on a very important aspect of ExchangeDefender deployment: IP restrictions. First we’ll start with a nice bright list of what the ranges are: > · ***65.99.255.0/24*** > > · ***206.125.40.0/24*** Now here’s why you need to first off add them for your client’s mail flow. Remember that in order for us to deliver mail on behalf of the original sender you have accept mail anonymously. This is very easy to do (it’s just the next tab on the receive connector GUI. The downside to allowing anonymous delivery WITHOUT the restrictions is that you’re one step away from being an “Open Relay”. If you’re an open relay, that will surely get your connection blacklisted on RBLs, it may get your access to our network revoked for a period of time based on the severity of the outbreak. So the cons of not setting these correctly are pretty huge: > · ***Interrupted/Inconsistent inbound mail flow*** > > · ***Outbound mail flow restrictions*** Carlos Lascano VP Support Services, ExchangeDefender (877) 546-0316 x737 [ Previous post ExchangeDefender and Shockey Monkey Quarterly Meeting April 5, 2012 ](https://www-preview.exchangedefender.com/blog/2012/04/exchangedefender-and-shockey-monkey-quarterly-meeting) [ Next post New Changes Coming to our Hosted Exchange April 11, 2012 ](https://www-preview.exchangedefender.com/blog/2012/04/new-changes-coming-to-our-hosted-exchange) Related Posts ------------- [ 1 May ](https://www-preview.exchangedefender.com/blog/2026/05/exchangedefender-new-ui-is-live)### [ExchangeDefender New UI is Live](https://www-preview.exchangedefender.com/blog/2026/05/exchangedefender-new-ui-is-live) [Read more: ExchangeDefender New UI is Live](https://www-preview.exchangedefender.com/blog/2026/05/exchangedefender-new-ui-is-live) [ ![](https://storage.services.exchangedefender.network/exchangedefender-blog/blog/2025/12/christmas-1.jpg) 25 Dec ](https://www-preview.exchangedefender.com/blog/2025/12/merry-christmas)### [Merry Christmas](https://www-preview.exchangedefender.com/blog/2025/12/merry-christmas) [Read more: Merry Christmas](https://www-preview.exchangedefender.com/blog/2025/12/merry-christmas) [ ![](https://storage.services.exchangedefender.network/exchangedefender-blog/blog/2025/11/Website-Screenshots-2025-4.jpg) 4 Nov ](https://www-preview.exchangedefender.com/blog/2025/11/why-iot-devices-are-a-hidden-security-risk-for-your-business)### [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) [Read more: 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) Search the blog Search Recent Posts ------------ - 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