No. 21 of 41 ·Transactional Email Software

Retarus Transactional Email

Web · API

Freedom report

One barScore 5.4

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

Retarus Transactional Email is ranked #21 of 41 in transactional email software on Freedom251, made by Retarus Transactional Email (Munich, Germany). It runs on API, Web. A free trial is offered.

Retarus Transactional Email plans and pricing

All plans

Free trial Free 30 days · maximum 5,000 emails · maximum 200 emails/hour · no load testing retarus.com · 1 Oct 2026

Transactional Email Not published REST and SMTP APIs · contractually guaranteed throughput · schedule a demo retarus.com · 1 Oct 2026

Compared on transactional email software

Phishing detection: Yes
Malware scanning: Yes
Attachment scanning: Yes
Quarantine access: user_and_admin
Supported mail platforms: Microsoft 365; existing email systems and mail servers
Quarantine retention: 30 days
Deployment type: cloud_gateway

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The record

Delivery methods: both
Event webhooks: Yes
Dedicated IP option: Yes
Purpose: Sends large volumes of transactional emails directly from business applications through Retarus Enterprise Cloud.
Delivery rate: Retarus states a delivery rate of 98% or higher.
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.
Interfaces: Transactional Email provides REST API and SMTP interfaces, with JSON and SMTP/MIME data-format support.
Integrations: Retarus says Transactional Email integrates directly with SAP, Microsoft, Salesforce, and ServiceNow business applications.
Authentication: Available authentication methods include SMTP basic authentication, SMTP source-IP authentication, and REST basic authentication.
Email security: Features include SPF, DKIM, DMARC, enforced TLS, antivirus multiscan, encrypted attachments, and message signing.
Compliance: Retarus states that its data centers fulfill requirements including EU GDPR, HIPAA, Sarbanes-Oxley, PCI DSS, CAN-SPAM, and TISAX.
Data centers: Retarus processes data in self-operated data centers in Germany, Switzerland, the United States, and Asia, without hyperscalers.
Monitoring: The myEAS web portal provides dashboards, real-time monitoring, reporting, and self-service configuration for administrators.
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.

Where it ranks on Freedom251

Best Transactional Email Software in 2026#21 of 41
Best Email Anti-Spam Software in 2026#7 of 26

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Sources

retarus.com/products/transactional-email/· checked 20 Sept 2026
docs.retarus.com/tem/transactional-email-description· checked 1 Oct 2026
retarus.com/products/transactional-email/native-api· checked 1 Oct 2026
docs.retarus.com/tem/product-sheet-transactional-email-1· checked 1 Oct 2026
retarus.com/blog/en/now-try-out-email-for-applicati· checked 1 Oct 2026
retarus.com/products/email-security/· checked 28 Sept 2026