Skip to content
SPECIFICTION
Get listed

Retarus Transactional Email

retarus.com

Free trial WebAPI
Visit retarus.com
Spec score 8.1 #24 of 41 in Transactional email services

What it is

Retarus Transactional Email sends high volumes of transactional messages from business applications through Retarus Enterprise Cloud. It offers REST API and SMTP interfaces, with JSON and SMTP/MIME formats, and direct connections to SAP, Microsoft, Salesforce, and ServiceNow. Retarus reports a delivery rate of 98% or higher and guaranteed processing capacity of 100,000 emails per hour; its Email API page separately states capacity of up to 10 million per hour. Administrators can use the myEAS web portal for dashboards, real-time monitoring, reporting, and configuration. The Email API can locate outbound messages by time, message ID, sender, or recipient and provides status information for the past 45 days. Security features include SPF, DKIM, DMARC, enforced TLS, antivirus multiscan, encrypted attachments, and message signing. Retarus processes data in self-operated centers in Germany, Switzerland, the United States, and Asia. The service is paid, with pricing on request. Its free trial costs nothing for 30 days, permits up to 5,000 emails, caps processing at 200 emails per hour, and excludes load testing.

Spec sheet

Purpose
Sends large volumes of transactional emails directly from business applications through Retarus Enterprise Cloud.Read 1 Oct 2026 · docs.retarus.com
Integrations
Retarus says Transactional Email integrates directly with SAP, Microsoft, Salesforce, and ServiceNow business applications.Read 1 Oct 2026 · retarus.com
Compliance
Retarus states that its data centers fulfill requirements including EU GDPR, HIPAA, Sarbanes-Oxley, PCI DSS, CAN-SPAM, and TISAX.Read 1 Oct 2026 · retarus.com
Support
Retarus describes support from expert staff with no call center or chatbots, covering scope, migration, production, and go-live.Read 1 Oct 2026 · retarus.com
Headquarters
Munich, GermanyRead 28 Sep 2026 · retarus.com
Founded
1992Read 28 Sep 2026 · retarus.com
Authentication
Available authentication methods include SMTP basic authentication, SMTP source-IP authentication, and REST basic authentication.Read 1 Oct 2026 · retarus.com
Data centers
Retarus processes data in self-operated data centers in Germany, Switzerland, the United States, and Asia, without hyperscalers.Read 1 Oct 2026 · retarus.com
Dedicated IP option
YesRead 20 Sep 2026 · retarus.com
Delivery methods
bothRead 20 Sep 2026 · retarus.com
Delivery rate
Retarus states a delivery rate of 98% or higher.Read 1 Oct 2026 · retarus.com
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.Read 1 Oct 2026 · retarus.com
Email security
Features include SPF, DKIM, DMARC, enforced TLS, antivirus multiscan, encrypted attachments, and message signing.Read 1 Oct 2026 · docs.retarus.com
Event webhooks
YesRead 20 Sep 2026 · retarus.com
Interfaces
Transactional Email provides REST API and SMTP interfaces, with JSON and SMTP/MIME data-format support.Read 1 Oct 2026 · retarus.com
Monitoring
The myEAS web portal provides dashboards, real-time monitoring, reporting, and self-service configuration for administrators.Read 1 Oct 2026 · retarus.com
Target customers
Retarus identifies software vendors, platform businesses, large enterprises, and highly regulated industries as target users.Read 1 Oct 2026 · retarus.com
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.Read 1 Oct 2026 · retarus.com
Trial restrictions
The documented free trial is limited to 30 days and 5,000 emails, with no more than 200 emails processed per hour.Read 1 Oct 2026 · retarus.com

Plans and prices

Free trial Free 30 days · maximum 5,000 emails · maximum 200 emails/hour · no load testing Read 1 Oct 2026 · retarus.com
Transactional Email Priced on request REST and SMTP APIs · contractually guaranteed throughput · schedule a demo Read 1 Oct 2026 · retarus.com

Every Retarus Transactional Email plan and price →

Strong points and limits

Strong points

  • Offers REST API and SMTP interfaces.
  • Integrates directly with SAP, Microsoft, Salesforce, and ServiceNow.
  • Includes monitoring, reporting, and self-service configuration.
  • Lists multiple email security controls.
  • Free trial allows up to 5,000 emails.

Limits

  • Trial lasts only 30 days.
  • Trial processing is capped at 200 emails per hour.
  • Trial does not allow load testing.
  • Paid service 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.

Verdict

Retarus provides API and SMTP routes, application integrations, monitoring, and a broad set of email security features. The trial has firm volume and throughput limits, while paid pricing requires an inquiry.

Where Specifiction places it

Alternatives to Retarus Transactional EmailAll alternatives →