Advanced Email Security for Microsoft 365 & Other Platforms
Filter out threats others overlook. Extra protection for your cloud email environment via our ICES connectors. Seamlessly integrated for added security.
Basic Is Not Enough, Boost Your Security
Quick, Easy Integration
Running a Hybrid Infrastructure?
Our email security solutions are also available as a cloud-based secure email gateway!
Add a Second Line of Defense
Customer Ratings and Reviews
“Our mail users have no troubles with using the processes related to Retarus. Releasing spam, maintaining personal black- and whitelists and understanding the need of an antispam/antimalware protection.”
Read full review IT Services, Management / Business Consulting
“In Retarus we have found a dependable partner for our email communications. Thanks to their reliable and innovative solutions, we are very well protected against any threats, both now and in the future.”
Read customer story Stefan Hopf, Head of Messaging and Collaboration, Continental AG
“Retarus Email Security is highly reliable and provides excellent detection rates.”
Read customer story Kurt Walther, Director Global IT and Business Intelligence, Puma AG
“Retarus is now so established at medbo that we simply think of you first whenever it comes to email. We get the impression that you all know what you’re doing.”
Read customer story Jürgen Schmalzbauer, Data Center Manager, medbo
“In a few words : The service works fine. It's easy to maintain and nearly self explaining. Our users are very pleased with Retarus. ”
Read full review Consumer Goods, IT
Protection You Can Depend On
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Support That Actually Helps
Even the best connector needs support now and then. That’s where we come in – direct, in person, as partners.
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More APIs – More Flexibility
Need APIs for cloud fax or enterprise SMS? Discover our powerful messaging interfaces.
Frequently Asked Questions
Do I have to deactivate Microsoft 365’s built-in security?
No. We complement Microsoft 365’s native security with additional layers—such as Advanced Threat Protection (ATP), sandboxing, and custom filtering. There’s no need to disable existing functions. Find out more in our Product Documentation Center.
What’s the advantage of ICES-based integration?
ICES-based integration strengthens your protection without requiring any infrastructure or MX records changes. It’s Ideal for organizations that want to retain existing Microsoft 365 licenses while upgrading security. For hybrid or on-prem environments, we recommend our Secure Email Gateway.
Can Retarus also scan outbound emails?
Yes. Our outbound connector inspects all outgoing messages, ensuring no harmful content leaves your organization – protecting both recipients and your reputation. Find out more in our Product Documentation Center.
Do these advanced checks slow down email delivery?
No. Our e-mail security performs a wide variety of checks in parallel with our high-performance infrastructure. This ensures fast processing – with average delivery times of just a few seconds.
Can I still monitor everything after integration?
Yes. The Retarus myEAS web portal gives administrators real-time insight into all email flows – including detailed tracking, message-level forensics, and analytics. SIEM integration is also available on request.
Do I need to integrate each of the Retarus modules myself?
No, we provide fully integrated solutions from a single source. The modules work seamlessly together – so there’s no extra effort required for implementation.
How does Retarus respond to new threats?
We leverage our own threat intelligence sources continuously update detection mechanisms. You benefit from dynamic protection that responds quickly and effectively to new attack sources and scenarios – no manual updates or actions required.