ExchangeDefender Whitelist vs. DEA (Disposable Email Addresses) | 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 October 27, 2020 · [ExchangeDefender](https://www-preview.exchangedefender.com/blog?category=exchangedefender) ExchangeDefender Whitelist vs. DEA (Disposable Email Addresses) =============================================================== ![](https://storage.services.exchangedefender.network/exchangedefender-blog/blog/2020/10/AdobeStock_137344495-1024x597.jpeg) ExchangeDefender is a cloud-based email firewall, and as such we enforce client's policies against the only email address that is trustworthy: ***the envelope from address***\*\*.\*\* Over the past few years there has been a significant increase in use of [disposable email addresses](https://en.wikipedia.org/wiki/Disposable_email_address) (DEA), specifically among mass/bulk mailing operations such as SendGrid, AmazonSES, MailJet, SMTP2Go, SocketLabs, Postmark, Mandrill, Mailgun, MailChimp, ConstantContact, etc. These email addresses, also known as "dark mail" create a unique email address to serve as the official From: line, in an effort to track bounces and delivery problems. Every time you get an email from one of these mass mailing operations the address the message actually came from is unique and generated just for that email/campaign - so whitelisting/blacklisting such addresses can be a challenge for clients that do not use ExchangeDefender's admin portal or quarantine reports (which detect BATS/DEA addresses and auto-suggest the domain or IP to create a policy). ![](https://www.exchangedefender.com/images-documentation/outlook-web-access-email.png) Bulk mail operations are not just used for mass marketing mail, where companies large and small do not want to build out the infrastructure to deliver tons of email. They are used for notifications, alerts, and most legitimate junk mail that you get. Unfortunately, the same companies are abused in virtually the same way by hackers to deliver spear phishing content. Because the body/header From: address can be easily faked, hackers hide behind places such as SendGrid, AmazonSES. Because they are highly automated, there is relatively little in the way of policing on these networks: after all, they make money to deliver junk mail to you and have little incentive to keep SPAM and phishing content from being sent through their networks. Over the years, we've taught countless MSPs and IT people the difference between the "envelope from" (routing address) and "header or body from" (fake, but friendly looking From address displayed in your email software like Gmail or Outlook). As our client base has changed over the years, we've decided to write up an intro-level explanation of the process and how to master it. You can find it here: [https://www.exchangedefender.com/docs/whitelist ](https://www.exchangedefender.com/docs/whitelist) We hope you can use it to better block or permit access to these operations. If you'd like our assistance with this process, please open a ticket at [https://support.ExchangeDefender.com](https://support.ExchangeDefender.com) and remember to attach the .eml file and/or full headers which are required for troubleshooting. **For our pro subscribers,** stay tuned. We've been hard at work on our antispam engine enhancements and we'll have a friendlier way to manage this by Thanksgiving 2020. [ Previous post Corporate Encryption: How to compose an encrypted message October 26, 2020 ](https://www-preview.exchangedefender.com/blog/2020/10/corporate-encryption-how-to-compose-an-encrypted-message) [ Next post Corporate Encryption Upgrade - What Did We Change? November 2, 2020 ](https://www-preview.exchangedefender.com/blog/2020/11/corporate-encryption-upgrade-see-new-features) 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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