Retarus Transactional Email: Fast, Reliable, and Secure
We offer guaranteed throughput rates, first-class inbox placement, and increased customer engagement through our reliable transactional email delivery.
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Those with the highest standards rely on us. They trust us. Because they can.
High Performance
Send high volumes of emails via API from your business applications with contractually guaranteed throughput rates without straining your own infrastructure.
Improve Your Reputation
Retarus is a leader in reputation management and CSA (Certified Senders Alliance) certified. We protect your domain, IP reputation and sender score.
Get The Most Out Of Your Email
Our comprehensive APIs simplifies your email workflows. Outsource resource-heavy capabilities like Templating, Sanitization, Optimizations, Rendering and more.
Expansive Compliance and Certifications
Adhere to local data protection regulations and 100% GDPR-compliance. We process data in self-operated data centers in Germany, Switzerland, US, or Asia.
Retarus Transactional Email Data Flow
- SMTPAUTH
- OAUTH
- IPAUTH
- DMARC
- DKIM
- SPF
- Unsubscribe list
- Suppression list
- Bounce management
- CSA Certified IPs
- Template rendering
- Address rewriting
- Message resend
- Campaign support
- Anti virus multiscan
- Message signing
- Secure document handling
- 3rd party archiving
- Spam Score Check Report
- Feedback Loop Reporting
- Open-/Link Tracking
- Bounce Reporting / Response Manager
- Trace and Recover
- SMTPAUTH
- OAUTH
- IPAUTH
- DMARC
- DKIM
- SPF
- Unsubscribe list
- Suppression list
- Bounce management
- CSA Certified IPs
- Template rendering
- Address rewriting
- Message resend
- Campaign support
- Anti virus multiscan
- Message signing
- Secure document handling
- 3rd party archiving
- Spam Score Check Report
- Feedback Loop Reporting
- Open-/Link Tracking
- Bounce Reporting / Response Manager
- Trace and Recover
Who is Retarus Transactional Email for?
One size does not fit all. Our clients rely on Retarus for highly capable, high-volume emailing to their end customers. Whether for critical communication, increasing customer engagement, application integration, or specialized requirements.
Software Vendors, Platform Businesses
Our ideal customers are fast-growing who rely on B2C emails for confirmations, invoices, and marketing, and need flexible, dependable solutions for time-sensitive, process-driven communications. Their workflows often trigger multiple messages per customer action, making them perfect candidates for scalable, reliable email solutions.
Large Enterprises
Diverse recipients and communication preferences, complex business workflows, and high-volume demand can quickly strain email infrastructure. Enterprises need an intuitive solution, especially when their Email Infrastructure is complex with on prem, cloud, legacy, or 3rd party applications, devices, subsidiaries.
Highly Regulated Industries
Sending or receiving critical information such as invoices, order confirmations, or time-sensitive notifications cannot afford any delays or land in spam. Strict compliance regulations in sectors such as healthcare, manufacturing, retail, finance, and legal force businesses to find a reliable, secure email solution.
Customer Ratings and Reviews
“We chose Retarus because they offered the most harmonized overall concept. In addition to the flexibility, speed and price-performance ratio, we were also convinced by their personal approach and the transfer of know-how.”
Read customer story Dominik Reichle, Channel Specialist EDI, Leuze
“We are delighted to have Retarus as a reliable and forward-thinking partner at our side.”
Read customer story Sales Project Management, Engelbert Strauss GmbH & Co. KG
“The system and process are stable – an order confirmation rate of more than 97 percent speaks for itself.”
Read customer story Ute Bätz, IT Operations, IT & Process Management , EagleBurgmann Germany GmbH & Co. KG
“Retarus has proven to be a reliable partner and has made a decisive contribution to the digital transformation of our accounting processes.”
Read customer story Anja Harms, Head of Accounting, Keller & Kalmbach
“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
Why Choose Retarus Transactional Email?
Highest Throughput Rates
Advanced Reputation Management and Beyond
- Unparalleled inbox placement (average sender score = 99, industry average is 85). Dynamic IP routing according to sender domain, CSA certification, bounce management. SPF, DKIM and DMARC implementation to maintain a high inbox placement.
- Convey trust, confirm email authenticity, and increase email acceptance with Messaging Signing.
Auditable Data Centers
- Data centers in the United States, in Europe and in the APAC region
- Retarus’ data centers are self-operated, self-sufficient, and redundant
- No hyperscalers, local data processing available
- Multi-client capability thanks to multi-domain configuration. Failover and load balancing options available
- All data centers are operated according to the latest standards and fulfill strict requirements: EU GDPR, HIPAA, Sarbanes-Oxley, or PCI DSS, CAN-SPAM, TISAX
Fast Implementation
- Our experienced team handles every detail of onboarding and go-live.
- Devoted service management makes sure you get the most out of your email.
Real People, Real Support
- No call center nor chatbots
- You get experts who know what they are doing
- We become part of your team from scope, migration, production and Go-live
Transactional Email Tailored to You
Native APIs & Gateways
Easily integrate Retarus Transactional Email into existing workflows via APIs including REST and SMTP to reduce complexity and bolster your landscape.
Transactional Email for Business Applications
Retarus Transactional Email integrates directly via business applications including SAP, Microsoft, Salesforce, or ServiceNow.
Frequently Asked Questions
Is there documentation available about compatibility and feature details?
Yes. Retarus Transactional Email supports numerous types of business applications and has a rich feature set. Detailed feature overviews and documentation can be found here.
Is the implementation of transactional email difficult?
Not with Retarus. Enterprises often have complicated requirements or critical processes that cannot be interrupted, but we have experience from thousands of successful migrations and onboardings with many of the world’s leading companies.
Where can I find out more?
Read our case studies and analyst reports. Check out our corporate blog and upcoming webinars, and feel free to book a demo. We’re always happy to help.