--- title: "SecurityGateway™ 12.5: A Refreshed Interface, Smarter Attachment Protection & More" description: Discover what’s new in SecurityGateway 12.5, including a refreshed interface, smarter attachment protection, and enhancements that improve email security, usability, and admin control. image: https://blog.mdaemon.com/hubfs/SecurityGateway-12.5-Now-Available.png --- [![MDaemon Technologies](https://blog.mdaemon.com/hs-fs/hubfs/MDaemon-Technologies_logo_large.png?width=564&height=110&name=MDaemon-Technologies_logo_large.png "MDaemon Technologies")](https://mdaemon.com/) - [Blog Home](https://blog.mdaemon.com) # MDaemon Technologies Blog ## [SecurityGateway™ 12.5: A Refreshed Interface, Smarter Attachment Protection & More](https://blog.mdaemon.com/securitygateway-12.5-a-refreshed-interface-smarter-attachment-protection-more) By [Brad Wyro](https://blog.mdaemon.com/author/brad-wyro) - [Tweet](https://twitter.com/share) SecurityGateway 12.5 is here, and it brings a refreshed web interface, stronger defenses against disguised and mismatched attachments, more flexible domain administrator controls, faster user verification for Google Workspace domains, DNS-based domain ownership verification, and a new REST API for automation. Together, these updates give administrators more control, better visibility, and stronger protection, with less manual work. Here's a closer look at what's new. # **A Cleaner Interface for Faster Admin Work** The SecurityGateway web interface has been refreshed with a cleaner layout and clearer visual hierarchy. Both the default light and dark themes have been updated, mobile support is improved (particularly on the dashboard), and a new classic theme is available if you prefer an experience closer to earlier versions. ![SecurityGateway for Email - Dashboard - Secure email gateway by MDaemon Technologies](https://blog.mdaemon.com/hs-fs/hubfs/SecurityGateway_Dashboard_blog.png?width=1202&height=855&name=SecurityGateway_Dashboard_blog.png) ## Stop Disguised Attachments Before They Reach Users SecurityGateway can now detect when an attachment's actual file type doesn't match its extension, a common trick spammers use to disguise executables as harmless files like PDFs. When a mismatch is found, you can choose to refuse, quarantine, or accept the message, with optional subject tagging and score adjustments. ![Attachment disguise protection in SecurityGateway for Email](https://blog.mdaemon.com/hs-fs/hubfs/SecurityGateway_Attachment-Disguise-Protection_blog.png?width=1202&height=816&name=SecurityGateway_Attachment-Disguise-Protection_blog.png) ## **C****lose the Extension-Spoofing Gap in Attachment Filtering** Attachment filtering rules can now match on a file's actual detected type, not just its extension. That means risky file types are still caught by your content filter even if someone renames the extension to try to slip past your filtering rules.   ## Faster User Verification for Google Workspace Domains Domains using Google Workspace can now verify local users directly through the Google Workspace API instead of relying on SMTP callbacks, for quicker and more reliable verification. ![Google Workspace user verificataion in SecurityGateway for Email by MDaemon Technologies](https://blog.mdaemon.com/hs-fs/hubfs/SecurityGateway_Google-Workspace-User-Verification_blog.png?width=1017&height=980&name=SecurityGateway_Google-Workspace-User-Verification_blog.png) ## Give Domain Admins Only the Access They Need Global administrators can now control which product areas each domain administrator is allowed to manage, including: - Per-domain maximum user limits - Domain mail servers - User verification sources - Domain admin delegation ![SecurityGateway for Email domain administrator permissions](https://blog.mdaemon.com/hs-fs/hubfs/SecurityGateway_Domain-Admin-Controls_blog.png?width=1202&height=880&name=SecurityGateway_Domain-Admin-Controls_blog.png) ## **Block Unauthorized Domain Setups Automatically** SecurityGateway now lets you require domain ownership verification before a new domain can receive mail. When enabled, each new domain stays in a pending state until its owner confirms control by publishing a simple TXT record to DNS, protecting you from unauthorized or accidental domain setups. ![Domain ownership verification in SecurityGateway for Email by MDaemon Technologies](https://blog.mdaemon.com/hs-fs/hubfs/SecurityGateway_Domain-Ownership_blog.png?width=1202&height=183&name=SecurityGateway_Domain-Ownership_blog.png) ## **Automate Admin Tasks with a New REST API** SecurityGateway now includes a modern REST/JSON API that helps you automate admin tasks and quickly connect with provisioning tools, identity systems, and your own custom workflows. For details, see the [SecurityGateway Release Notes](https://files.mdaemon.com/securitygateway/release/relnotes_en.htm).   ### **Additional Improvements** - Dynamic Screening has been extended with additional controls for how failed authentication attempts are tracked and blocked. - SecurityGateway now supports the PROXY protocol (v1 and v2), so you can place it behind HAProxy or a similar load balancer and it will still see each connection's real client IP address and SNI hostname instead of the load balancer's. - SecurityGateway now validates DNSSEC when delivering outbound mail, giving you stronger assurance that messages reach the legitimate recipient server rather than an impostor. This can also help satisfy REQUIRETLS for encrypted delivery, reducing your reliance on MTA-STS so sensitive email stays private with less configuration on your end. - Custom per-domain quarantine report settings have been added. - SNI-based domain identification for SMTP connections lets SecurityGateway identify the correct domain earlier in the session, so its SMTP host name is available immediately after STARTTLS. For a complete list of new features and updates, see the [SecurityGateway Release Notes](https://files.mdaemon.com/securitygateway/release/relnotes_en.htm). ## **Try SecurityGateway 12.5 Free for 30 Days** SecurityGateway 12.5 is available now. Visit the [Downloads page](https://mdaemon.com/pages/downloads-security-gateway-free-trial) to start your 30-day free trial and see these new features in action. Tags: [Product Updates](https://blog.mdaemon.com/topic/product-updates), [SecurityGateway](https://blog.mdaemon.com/topic/securitygateway), [Software update](https://blog.mdaemon.com/topic/software-update) ![Brad Wyro](https://blog.mdaemon.com/hs-fs/hubfs/Brad-2023v2.jpg?width=100&height=100&name=Brad-2023v2.jpg) #### Written by [Brad Wyro](https://blog.mdaemon.com/author/brad-wyro) Brad has worked in technical and marketing roles at MDaemon Technologies, where he contributes as Content Marketing Manager. Brad balances technical and creative information to develop easy to understand videos and content to educate prospects and customers. 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[Training (1)](https://blog.mdaemon.com/tag/training) - [Troubleshooting (1)](https://blog.mdaemon.com/tag/troubleshooting) - [Upgrade (1)](https://blog.mdaemon.com/tag/upgrade) - [Web Conferencing (1)](https://blog.mdaemon.com/tag/web-conferencing) - [Windows Server (1)](https://blog.mdaemon.com/tag/windows-server) - [internal email threat (1)](https://blog.mdaemon.com/tag/internal-email-threat) - [ssl (1)](https://blog.mdaemon.com/tag/ssl) - [tax scams (1)](https://blog.mdaemon.com/tag/tax-scams) See all #### About MDaemon Technologies MDaemon Technologies is a pioneer in developing email and email security software helping to protect customers from evolving cyber-security threats. Its products and services are trusted by thousands of organizations in over 140 countries. For more than two decades, the company’s products have been developed with the ongoing input of IT professionals who demand reliable, affordable software that requires minimal effort to manage. The software can be deployed in virtual, hosted cloud, on-premises, or hybrid network environments. The company sells its software and services directly and through a network of global channel partners. For more information, visit [www.mdaemon.com](https://www.altn.com/). Copyright © 1996-2026 MDaemon Technologies.  View [privacy policy](https://mdaemon.com/policies/privacy-policy).   ###### Contact Us +1.817-601-3222 [sales@help.mdaemon.com](mailto:sales@help.mdaemon.com) 6340 Lake Worth Blvd. Fort Worth, TX 76135 ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Brad Wyro", "url" : "https://blog.mdaemon.com/author/brad-wyro" }, "dateModified" : "2026-08-20T14:30:28.671Z", "datePublished" : "2026-07-28T17:30:47.000Z", "headline" : "SecurityGateway™ 12.5: A Refreshed Interface, Smarter Attachment Protection & More", "image" : [ "https://blog.mdaemon.com/hubfs/SecurityGateway-12.5-Now-Available.png" ], "mainEntityOfPage" : { "@id" : "https://blog.mdaemon.com/securitygateway-12.5-a-refreshed-interface-smarter-attachment-protection-more", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://blog.mdaemon.com/hubfs/MDaemon-Technologies_logo_large.png" }, "name" : "MDaemon Technologies" } } ```