Achieve a Better Delivery Rate for Your Transactional Emails with Email Service Provider Retarus.
With Retarus’ transactional email service—which is part of the Retarus Secure Email Platform—you can send high volumes of emails directly from your business applications via the Retarus Enterprise Cloud.
Unburden your own infrastructure, become a trusted sender and send transactional emails in compliance with local data protection regulations. As email service provider, Retarus processes your data in its own data centers—contractually agreed in the United States, Germany, Switzerland, or Asia. Ensuring the security of your emails from applications.
Retarus E-Mail API
Speed up your communication with our high performance emails. With Retarus Transactional Email you can send up to 10 million emails per hour at peak times, contractually guaranteed by your Service Level Agreement. Business applications can be connected via a modern Transactional Email API (e.g. a REST/JSON API) or directly via SMTP.
- Multi Interface Architecture
- Data Validation
- Queueing
- CSA compliant Email Rendering
- High Volume Delivery Platform
- Setup and Configuration
- Tracking and Reporting
- Reputation Management

“Connecting to the service via standard interfaces such as SMTP und REST enables a virtually seamless technical transition, especially with such a large number of different applications.”
Manfred Eder, Group Head Messaging and Communication Services, BSH Hausgeräte GmbH

White Paper
Learn how you can protect your reputation with Retarus’ enterprise email service as a sender and consistently improve the delivery rate of your emails by reading our whitepaper “Reputation management, a key factor in your company’s success: How your emails are placed exactly where you want them to be”.

Prevent the Slowing of Online Business While It Continues to Grow.
The Retarus Deliverability Guide will show you how you can maintain your sender reputation as your email volume increases and ensure that transactional emails reach the inboxes of your recipients quickly and reliably. The Retarus Deliverability Guide is available to you now as a PDF, free for download.
Bounce Management Included
Another key element to protecting your reputation as a sender are Retarus Suppression Lists. They cache erroneous recipient email addresses when sending bulk emails and block resend attempts prior to sending. And you learn which recipients cannot be reached and why, so you can maintain your distribution list and ensure that you do not generate any unnecessary bounces.
In addition to comprehensive transactional email API functions, the Retarus EAS Portal (Enterprise Administration Services Portal) displays tracking and status information of messages at all times. These can be analyzed, so you can quickly clean up and optimize master data.
The Features of Retarus Transactional Email at a Glance:
Advantages of the Retarus Transactional Email Service
Use Cases: Transactional Email Solutions for Real World Applications
Add-on module
For Complex Email Infrastructures
With Retarus Transactional Email, campaigns sent from applications remain separated from business and user-based communications. Your reputation remains intact even when sending extremely large volumes of emails. With more than a quarter of a century of emailing experience, you can count on Retarus’ expertise to help you optimize the setup and operation of your system. This makes Retarus the ideal partner for sending emails from applications and marketing emails that effectively reach your recipients.
End-to-end and perfectly harmonized modules for complex email infrastructures complement Transactional Email with other useful add-ons, features, and services. The smart Trace & Recover short-term storage enables your employees in service or the contact center to easily find transactional customer emails at any time, even without access rights to the business application used in the workflow.
The Bounce and Response Manager is our answer to solving the challenges of your inbound channel, allowing you to organize and manage your inbox automatically using your own set of rules.
Be prepared in the face of an emergency: With Email Continuity your employees are covered at all times in the event your primary email infrastructure fails, thanks to a pre-provisioned and user-friendly cloud webmail service. And with the powerful options of Predelivery Logic, workflow automation for incoming emails is virtually unlimited. As you can expect, all of this is closely integrated with the other Retarus Secure Email Platform services.

Increase the Delivery Rate for Transactional Emails and Relieve Your Own Infrastructure
Learn more about how Retarus’ enterprise email service can help you reliably achieve your goals. Our experts are happy to consult with you. By phone, email, or on site.