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Retarus Transactional Email

Retarus Transactional Email sends high volumes of transactional emails from business applications through Retarus Enterprise Cloud.

Place
#28 of 41
Score
6.7
Retarus Transactional Email's website

What Retarus Transactional Email is

Retarus Transactional Email sends high volumes of transactional emails from business applications through Retarus Enterprise Cloud. Businesses can connect through REST API or SMTP interfaces, using JSON or SMTP/MIME data formats, and Retarus says it integrates directly with SAP, Microsoft, Salesforce and ServiceNow applications. The service offers SMTP basic authentication, SMTP source-IP authentication and REST basic authentication. Retarus states a delivery rate of 98% or higher and guaranteed processing capacity of 100,000 emails per hour; its Email API page states capacity of up to 10 million per hour. Administrators can use the myEAS web portal for dashboards, real-time monitoring, reports and self-service configuration. Security features include SPF, DKIM, DMARC, enforced TLS, antivirus multiscan, encrypted attachments and message signing. Retarus processes data in its own data centers in Germany, Switzerland, the United States and Asia. Pricing is available on request. The free trial lasts 30 days, allows up to 5,000 emails and limits processing to 200 emails per hour; it does not allow load testing.

Good

  • Provides REST API and SMTP interfaces.
  • Integrates with SAP, Microsoft, Salesforce and ServiceNow.
  • Includes real-time monitoring and reporting through myEAS.
  • Offers a 30-day free trial.
  • Supports email search with status information for the past 45 days.

Watch out

  • Trial is limited to 5,000 emails.
  • Trial processing is capped at 200 emails per hour.
  • Trial does not allow load testing.
  • Commercial pricing is available on request.

Who it suits

The service is aimed at software vendors, platform businesses, large enterprises and highly regulated industries that send transactional email from business applications. It may suit teams that need REST or SMTP integration and administrative monitoring.

Verdict

Retarus Transactional Email offers API and SMTP delivery with administrative monitoring and multiple email security measures. The trial has volume and processing limits, while commercial pricing requires a request.

Plans and prices

From Retarus Transactional Email's own pricing page, checked 1 Oct 2026.

All about pricing
PlanPriceWhat it gives you
Free trialFree30 days · maximum 5,000 emails · maximum 200 emails/hour · no load testing
Transactional EmailPriced on requestREST and SMTP APIs · contractually guaranteed throughput · schedule a demo

The facts

Each one read from Retarus Transactional Email's own pages, with the date it was checked.

What it does

Authentication
Available authentication methods include SMTP basic authentication, SMTP source-IP authentication, and REST basic authentication.checked 1 Oct 2026
Compliance
Retarus states that its data centers fulfill requirements including EU GDPR, HIPAA, Sarbanes-Oxley, PCI DSS, CAN-SPAM, and TISAX.checked 1 Oct 2026
Data centers
Retarus processes data in self-operated data centers in Germany, Switzerland, the United States, and Asia, without hyperscalers.checked 1 Oct 2026
Dedicated IP option
Yeschecked 20 Sep 2026
Delivery methods
bothchecked 20 Sep 2026
Delivery rate
Retarus states a delivery rate of 98% or higher.checked 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.checked 1 Oct 2026
Email security
Features include SPF, DKIM, DMARC, enforced TLS, antivirus multiscan, encrypted attachments, and message signing.checked 1 Oct 2026
Event webhooks
Yeschecked 20 Sep 2026
Integrations
Retarus says Transactional Email integrates directly with SAP, Microsoft, Salesforce, and ServiceNow business applications.checked 1 Oct 2026
Interfaces
Transactional Email provides REST API and SMTP interfaces, with JSON and SMTP/MIME data-format support.checked 1 Oct 2026
Monitoring
The myEAS web portal provides dashboards, real-time monitoring, reporting, and self-service configuration for administrators.checked 1 Oct 2026
Purpose
Sends large volumes of transactional emails directly from business applications through Retarus Enterprise Cloud.checked 1 Oct 2026
Support
Retarus describes support from expert staff with no call center or chatbots, covering scope, migration, production, and go-live.checked 1 Oct 2026
Target customers
Retarus identifies software vendors, platform businesses, large enterprises, and highly regulated industries as target users.checked 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.checked 1 Oct 2026

The company

Founded
1992checked 28 Sep 2026
Headquarters
Munich, Germanychecked 28 Sep 2026

Money

Trial restrictions
The documented free trial is limited to 30 days and 5,000 emails, with no more than 200 emails processed per hour.checked 1 Oct 2026

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