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Retarus Transactional Email
Retarus Transactional Email · Munich, Germany · founded 1992
What it is
Retarus Transactional Email sends large volumes of transactional messages from business applications through Retarus Enterprise Cloud. Connections use REST API or SMTP, with JSON and SMTP/MIME formats, and direct integrations are available for SAP, Microsoft, Salesforce, and ServiceNow. Retarus states delivery of 98% or higher. One description guarantees processing capacity of 100,000 emails per hour, while the Email API page states capacity of up to 10 million per hour. Authentication options include SMTP basic authentication, source-IP authentication, and REST basic authentication. Security controls include SPF, DKIM, DMARC, enforced TLS, antivirus multiscan, encrypted attachments, and message signing. The myEAS portal provides dashboards, real-time monitoring, reports, and self-service administration. Email API searches can use time period, message ID, sender, or recipient, with status information for the past 45 days. Retarus processes data in self-operated centers in Germany, Switzerland, the United States, and Asia. Pricing is on request. The free trial lasts 30 days, allows 5,000 emails, and limits processing to 200 emails per hour. Retarus is headquartered in Munich and was founded in 1992.
For and against
For
- REST and SMTP interfaces
- Direct SAP, Microsoft, Salesforce, ServiceNow integrations
- Security controls include SPF, DKIM, and DMARC
- Monitoring portal with dashboards and reports
- Free trial available
Against
- Pricing requires a request
- Trial limited to 5,000 emails
- Trial processing capped at 200 emails/hour
- Email status search covers 45 days
The verdict
Retarus Transactional Email combines application interfaces, monitoring, and listed email-security controls for business messaging. The short, capped trial and request-based pricing make capacity planning important.
Who it suits
It suits software vendors, platform businesses, large enterprises, and regulated industries sending application-generated email. API and SMTP interfaces support existing business systems.
Plans and prices
Free trial
30 days · maximum 5,000 emails · maximum 200 emails/hour · no load testing
Read 1 Oct 2026 · retarus.com
Transactional Email
REST and SMTP APIs · contractually guaranteed throughput · schedule a demo
Read 1 Oct 2026 · retarus.com
On the record
- Authentication
- Available authentication methods include SMTP basic authentication, SMTP source-IP authentication, and REST basic authentication.retarus.com · read 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 · read 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 · read 1 Oct 2026
- Dedicated IP option
- Yesretarus.com · read 20 Sep 2026
- Delivery methods
- bothretarus.com · read 20 Sep 2026
- Delivery rate
- Retarus states a delivery rate of 98% or higher.retarus.com · read 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 · read 1 Oct 2026
- Email security
- Features include SPF, DKIM, DMARC, enforced TLS, antivirus multiscan, encrypted attachments, and message signing.docs.retarus.com · read 1 Oct 2026
- Event webhooks
- Yesretarus.com · read 20 Sep 2026
- Integrations
- Retarus says Transactional Email integrates directly with SAP, Microsoft, Salesforce, and ServiceNow business applications.retarus.com · read 1 Oct 2026
- Interfaces
- Transactional Email provides REST API and SMTP interfaces, with JSON and SMTP/MIME data-format support.retarus.com · read 1 Oct 2026
- Monitoring
- The myEAS web portal provides dashboards, real-time monitoring, reporting, and self-service configuration for administrators.retarus.com · read 1 Oct 2026
- Purpose
- Sends large volumes of transactional emails directly from business applications through Retarus Enterprise Cloud.docs.retarus.com · read 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 · read 1 Oct 2026
- Target customers
- Retarus identifies software vendors, platform businesses, large enterprises, and highly regulated industries as target users.retarus.com · read 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 · read 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 · read 1 Oct 2026
