Outbound SPAM Filtration | 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. [Sign Up](/sign-up) [Live Demo](/demo) [Email Security Stops spam, malware & phishing in real time. ](/email-security) [Encryption Secure your emails, attachments & sensitive data. ](/corporate-email-encryption) [Web File Sharing Easy, safe cloud file sharing with access control. ](/web-file-server) [Live Archive Locked-in email backup & continuity during outages. ](/livearchive-backup) [Emergency Inbox Keep email flowing without interruption if your provider fails. ](/inbox) [Spearphish Train your team with phishing simulations & risk tracking. ](/spearphishing) Managed Email ### Enterprise-Grade Managed Email Reliable, secure, and fully managed email operations for modern organizations. ![ExchangeDefender](/assets/images/managed_email_menu.png) [Microsoft365/Google Email Management Expert management and security for Microsoft 365 and Google Workspace email. ](/managed-email-operations) [AI Advisory Secure, practical AI consulting & implementation for SMBs. ](/management-ai) Company ### ExchangeDefender: 29+ Years of Trust We are a cybersecurity company focused on business email protection, with 29+ years of experience keeping organizations secure, connected, and resilient. ![ExchangeDefender](/assets/images/careers_1.png) [ About Us Learn our purpose, values, and the mission behind every decision. ](/about-us) [ Blog News, product updates and email security insights. ](/blog) [ Capabilities Discover the tech and expertise that keep your email secure around the clock ](/capabilities) [ Careers Be part of a team using modern tech to solve real threats and ship great work. ](/careers) [Partners](/partners) [Docs](/docs) [Contact Us](/contact) Talk to a Human Open menu Menu ---- Email Security [Email Security](/email-security) [Encryption](/corporate-email-encryption) [Web File Sharing](/web-file-server) [Live Archive](/livearchive-backup) [Inbox](/inbox) [Spearphish](/spearphishing) Managed Email [Microsoft365/Google Email Management](/managed-email-operations) [AI Advisory](/management-ai) Company [About Us](/about-us) [Blog](/blog) [Capabilities](/capabilities) [Careers](/careers) [Partners](/partners) [Docs](/docs) [Contact Us](/contact) Talk to a Human September 4, 2012 · [Support](https://www-preview.exchangedefender.com/blog?category=support) Outbound SPAM Filtration ======================== [![clip_image002](http://www.exchangedefender.com/blog/media/9a8f7f1c006c_D40E/clip_image002_thumb.jpg)](http://www.exchangedefender.com/blog/media/9a8f7f1c006c_D40E/clip_image002.jpg)In order to ensure on time delivery and limit the network's exposure to items with a negative impact on the network reputation, we've started enforcing an additional layer of security. You may have come across a message rejection that looks like this. *“Rejected. Please contact your service provider: Your message contained a SPAM URL and was blocked by ExchangeDefender.”* ExchangeDefender scans all outbound messages for possible SPAM patterns. This particular message contained a SPAMvertised URL which is typically a compromised web site or URL used in thousands of confirmed SPAM messages by a third party authority (Realtime Blacklist). In order to keep you from blacklists and RBL systems, we automatically block messages with SPAM web addresses and return to the sender. This way your legitimate messages do not end up delayed or in junk folders with other service providers. [![clip_image004](http://www.exchangedefender.com/blog/media/9a8f7f1c006c_D40E/clip_image004_thumb.jpg)](http://www.exchangedefender.com/blog/media/9a8f7f1c006c_D40E/clip_image004.jpg)ExchangeDefender outbound relays cannot deliver outbound mail with the SPAMvertised URL(s) in it until it is removed from the blacklists. In order to protect your server ExchangeDefender will automatically block these messages. You can choose not to use ExchangeDefender outbound servers but if you do so your mail server will likely end up on an RBL and then you will not be able to relay through ExchangeDefender even after you remove your server from the URIBL lists. If you run into these rejections please give my staff the from, to, and relay IP and they will be able to help you find out the content triggering the rejection. Carlos Lascano VP Support Services, ExchangeDefender (877) 546-0316 x737 [ Previous post The Easiest Way to Market ExchangeDefender Solutions August 31, 2012 ](https://www-preview.exchangedefender.com/blog/2012/08/the-easiest-way-to-market-exchangedefender-solutions) [ Next post ExchangeDefender Corporate Encryption September 6, 2012 ](https://www-preview.exchangedefender.com/blog/2012/09/exchangedefender-corporate-encryption) Related Posts ------------- [ 5 Oct ](https://www-preview.exchangedefender.com/blog/2021/10/exchangedefender-support)### [ExchangeDefender Support](https://www-preview.exchangedefender.com/blog/2021/10/exchangedefender-support) [Read more: ExchangeDefender Support](https://www-preview.exchangedefender.com/blog/2021/10/exchangedefender-support) [ 27 Oct ](https://www-preview.exchangedefender.com/blog/2020/10/exchangedefender-whitelist-vs-dea-disposable-email-addresses)### [ExchangeDefender Whitelist vs. DEA (Disposable Email Addresses)](https://www-preview.exchangedefender.com/blog/2020/10/exchangedefender-whitelist-vs-dea-disposable-email-addresses) [Read more: ExchangeDefender Whitelist vs. DEA (Disposable Email Addresses)](https://www-preview.exchangedefender.com/blog/2020/10/exchangedefender-whitelist-vs-dea-disposable-email-addresses) [ 21 Feb ](https://www-preview.exchangedefender.com/blog/2020/02/new-service-manager-for-exchange-2016-explained)### [New Service Manager for Exchange 2016 - Explained!](https://www-preview.exchangedefender.com/blog/2020/02/new-service-manager-for-exchange-2016-explained) [Read more: New Service Manager for Exchange 2016 - Explained!](https://www-preview.exchangedefender.com/blog/2020/02/new-service-manager-for-exchange-2016-explained) 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) - [ExchangeDefender](https://www-preview.exchangedefender.com/blog?category=exchangedefender) (349) - [General](https://www-preview.exchangedefender.com/blog?category=uncategorized) (590) - [Hosted Services](https://www-preview.exchangedefender.com/blog?category=hosted-services) (86) - [Industry News](https://www-preview.exchangedefender.com/blog?category=industrynews) (29) - [Marketing](https://www-preview.exchangedefender.com/blog?category=marketing) (18) - [Phishing](https://www-preview.exchangedefender.com/blog?category=phishing) (5) - [PRO TIPS](https://www-preview.exchangedefender.com/blog?category=pro-tips) (44) - [Product Features](https://www-preview.exchangedefender.com/blog?category=product-features) (54) - [Security](https://www-preview.exchangedefender.com/blog?category=security) (65) - [Shockey Monkey](https://www-preview.exchangedefender.com/blog?category=shockey-monkey) (22) - [Spamfilter](https://www-preview.exchangedefender.com/blog?category=spamfilter) (5) - [Support](https://www-preview.exchangedefender.com/blog?category=support) (45) - [Webinars](https://www-preview.exchangedefender.com/blog?category=webinars) (44) Solutions --------- - [Stop Spam & Malware](/email-security) - [Hands-Free Email Backup](/livearchive-backup) - [Instant Email Recovery](/inbox) - [Send Private Emails](/corporate-email-encryption) - [Train Against Email Threats](/spearphishing) - [Share Files Safely](/web-file-server) Company ------- - [About ExchangeDefender](/about-us) - [Compliance & Legal](/our-compliance) - [Become a Partner](/partners) - [Support Portal Login](https://support.exchangedefender.com/) - [Microsoft 365 Email Management](/managed-email-operations) - [AI Advisory Service](/management-ai) ![ExchangeDefender](/assets/images/dark-xd-logo.png)USA: +1 (407) 465-6800 United Kingdom: 0800 8620149 Australia: +61 0390010641 Fax: +1 (954) 839-8737 [ ](https://www.facebook.com/ExchangeDefender) [ ](https://www.twitter.com/XD_Defender) [ ](https://www.linkedin.com/company/exchangdefender) [ ](/blog) © 2026 Own Web Now Corp - All rights reserved </> with ❤️ in Orlando [SLA](/sla) [TOS](/tos) [PRIVACY](/privacy-end-users) [AUP](/aup) We're Here to Help 👋 -------------------- Tired of AI 🤖 and hold music? Request a call or text (sms/telco charges may apply) and someone with a brain and a pulse will get in touch with you promptly. Close modal Website Name Email Address Company Phone Preferred Contact Method Text me Call me Call Date Call Time Time Zone Eastern Central Mountain Pacific London Paris Madrid Berlin Tokyo Dubai Sydney Request Human Contact Submitting... Close Start Your Free Year -------------------- Enter your details and we will set up your free year of email protection. Close modal Website Full Name Email Continue Submitting... Close Try ExchangeDefender for Free 💰 ------------------------------- We look forward to helping you secure your email. We offer a free 30-day no-risk trial, just fill out the form below and one of our onboarding techs will get you started. If you'd just like to take a look at the demo, click here for a [live demo site](/demo). Close modal Website Name Email Address Company Phone Preferred Contact Method Text me Call me Call Date Call Time Time Zone Eastern Central Mountain Pacific London Paris Madrid Berlin Tokyo Dubai Sydney 💰 Get your free month Submitting... 🏃 Explore a Live Demo Submitting... Close Train Your Team Before the Hackers Do 👋 --------------------------------------- ExchangeDefender Spearphish is our new phishing simulation and training tool, designed to help your team spot scams before they click. Want to be first in line? Request early access or get a personal demo — just drop your name and email below. Close modal Website Name Email Address Company Phone Preferred Contact Method Text me Call me Call Date Call Time Time Zone Eastern Central Mountain Pacific London Paris Madrid Berlin Tokyo Dubai Sydney Request Early Access Submitting... Close