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Retarus Transactional Email

What Retarus Transactional Email is
Retarus Transactional Email sends high volumes of transactional messages from business applications through Retarus Enterprise Cloud. It offers REST API and SMTP interfaces, supports JSON and SMTP/MIME formats, and connects directly with SAP, Microsoft, Salesforce, and ServiceNow. Retarus states a delivery rate of 98% or higher. It gives a guaranteed processing capacity of 100,000 emails per hour, while its Email API page describes capacity of up to 10 million per hour. Administrators can use the myEAS web portal for dashboards, real-time monitoring, reporting, and self-service configuration. Security features include SPF, DKIM, DMARC, enforced TLS, antivirus multiscan, encrypted attachments, and message signing. Retarus also describes phishing detection, malware and attachment scanning, and quarantine access for users and administrators. Data is processed in Retarus-operated centers in Germany, Switzerland, the United States, and Asia. The Email API can search outbound messages by time period, message ID, sender, or recipient, with status information for the past 45 days. The service is aimed at software vendors, platform businesses, large enterprises, and regulated industries. It is available on web and through API, with pricing on request and a 30-day trial capped at 5,000 emails and 200 emails per hour.
Who it suits
Retarus identifies software vendors, platform businesses, large enterprises, and highly regulated industries as target customers. It suits organizations sending transactional email from business applications that need API or SMTP access, monitoring, and integrations with business software.
What it does well
- Connects with SAP, Microsoft, Salesforce, and ServiceNow.
- Offers REST API and SMTP interfaces with JSON and SMTP/MIME support.
- Includes dashboards, real-time monitoring, reports, and administrator self-service.
- Provides email search with status information for the past 45 days.
- Processes data in Retarus-operated centers across four regions.
What to know first
- Pricing is available on request.
- The free trial lasts 30 days and caps use at 5,000 emails.
- Trial processing is limited to 200 emails per hour.
Limits
The free trial lasts 30 days, allows a maximum of 5,000 emails, and processes no more than 200 emails per hour. The paid plan's price is available on request.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free trial | 30 days · maximum 5,000 emails · maximum 200 emails/hour · no load testing | Free |
| Transactional Email | REST and SMTP APIs · contractually guaranteed throughput · schedule a demo | On request |
As retarus.com lists them, read 1 Oct 2026. The maker's own page has the final word.
Getting started
- Open the Retarus Transactional Email website.
- Choose the 30-day free trial or schedule a demo for the paid service.
- Connect through the REST API or SMTP interface using JSON or SMTP/MIME formats.
- Configure an integration with SAP, Microsoft, Salesforce, or ServiceNow if relevant.
- Use the myEAS web portal for monitoring, reporting, and self-service configuration.
Verdict
Consider Retarus Transactional Email if your organization needs transactional messaging from business applications, API and SMTP interfaces, and the listed monitoring and security features. The main reason to look elsewhere is that the paid service requires a pricing request, while the trial has volume and throughput caps.
Questions
How much does Retarus Transactional Email cost?
Pricing for the paid Transactional Email plan is available on request. The free trial is listed at 0.00 USD for 30 days.
What are the free trial limits?
The trial is limited to 5,000 emails and 200 emails processed per hour.
What interfaces and formats does it support?
It provides REST API and SMTP interfaces, with JSON and SMTP/MIME data-format support.
Which business applications does it integrate with?
Retarus says it integrates directly with SAP, Microsoft, Salesforce, and ServiceNow.
Where does Retarus process data?
Retarus says it uses self-operated data centers in Germany, Switzerland, the United States, and Asia.
Facts from Retarus Transactional Email's own pages
- Authentication
- Available authentication methods include SMTP basic authentication, SMTP source-IP authentication, and REST basic authentication. · retarus.com, 1 Oct 2026
- Compliance
- Retarus states that its data centers fulfill requirements including EU GDPR, HIPAA, Sarbanes-Oxley, PCI DSS, CAN-SPAM, and TISAX. · retarus.com, 1 Oct 2026
- Data centers
- Retarus processes data in self-operated data centers in Germany, Switzerland, the United States, and Asia, without hyperscalers. · retarus.com, 1 Oct 2026
- Dedicated IP option
- Yes · retarus.com, 20 Sept 2026
- Delivery methods
- both · retarus.com, 20 Sept 2026
- Delivery rate
- Retarus states a delivery rate of 98% or higher. · retarus.com, 1 Oct 2026
- Email search
- The Email API supports searching outbound emails by time period, message ID, sender, and recipient, with status information for the past 45 days. · retarus.com, 1 Oct 2026
- Email security
- Features include SPF, DKIM, DMARC, enforced TLS, antivirus multiscan, encrypted attachments, and message signing. · docs.retarus.com, 1 Oct 2026
- Event webhooks
- Yes · retarus.com, 20 Sept 2026
- Founded
- 1992 · retarus.com, 28 Sept 2026
- Headquarters
- Munich, Germany · retarus.com, 28 Sept 2026
- Integrations
- Retarus says Transactional Email integrates directly with SAP, Microsoft, Salesforce, and ServiceNow business applications. · retarus.com, 1 Oct 2026
- Interfaces
- Transactional Email provides REST API and SMTP interfaces, with JSON and SMTP/MIME data-format support. · retarus.com, 1 Oct 2026
- Monitoring
- The myEAS web portal provides dashboards, real-time monitoring, reporting, and self-service configuration for administrators. · retarus.com, 1 Oct 2026
- Purpose
- Sends large volumes of transactional emails directly from business applications through Retarus Enterprise Cloud. · docs.retarus.com, 1 Oct 2026
- Support
- Retarus describes support from expert staff with no call center or chatbots, covering scope, migration, production, and go-live. · retarus.com, 1 Oct 2026
- Target customers
- Retarus identifies software vendors, platform businesses, large enterprises, and highly regulated industries as target users. · retarus.com, 1 Oct 2026
- Throughput
- The service states guaranteed processing capacity of 100,000 emails per hour, while its Email API page states capacity of up to 10 million emails per hour. · retarus.com, 1 Oct 2026
- Trial restrictions
- The documented free trial is limited to 30 days and 5,000 emails, with no more than 200 emails processed per hour. · retarus.com, 1 Oct 2026
Where Retarus Transactional Email stands on Freedom251
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