What Retarus does

Retarus GmbH is a Munich-headquartered, privately held cloud communications provider founded in 1992 that delivers business-critical messaging infrastructure to enterprises across Europe and North America. The company's platform spans five core franchises — Cloud Fax, Transactional Email, Enterprise SMS, Email Security, and Business Process Solutions — supplemented by modular add-ons (Advanced Threat Protection, Sandboxing, Post-Delivery Protection, Email Continuity, Encryption, Archive, Policy Engine) and specialized sub-products including Intelligent Document Processing, Cloud EDI Gateway, WebConnect for Suppliers, and Global E-Invoicing. The technical foundation rests on Retarus-owned global data centers with REST/SMTP/SFTP APIs, ISAE 3402 Type II, PCI DSS, HIPAA, and GDPR certifications, and native integrations into SAP, Epic, Cerner, Microsoft 365 (Outlook, Power Platform, Teams, Copilot Studio), Salesforce, and Dynamics. Recent additions such as the Docs MCP Server and Configuration API for Email Security indicate a deliberate expansion into AI-assisted developer tooling and programmable security operations.

Retarus operates a hybrid GTM combining direct enterprise sales, self-serve customer portals (Enterprise Fax Portal, EAS, WebExpress), marketplace listings on Salesforce AppExchange/AgentExchange and Microsoft Power Platform, and a regional channel reseller network. Pricing is quote-based and not publicly disclosed, structured as usage-based (pay-per-use) billing for messaging services and subscription for security offerings, effectively converting customer CAPEX on fax infrastructure into OPEX. Customer concentration spans healthcare (B. Braun, Beth Israel Lahey Health), logistics (Dachser), financial services (DZ BANK), manufacturing (Feinmetall, TRILUX, Gira), and software (Twoday), with multi-year relationships evidencing high retention. The business is founder-led (Martin Hager, Founder and CEO) with 251–500 employees and no disclosed institutional funding rounds, consistent with a self-funded, cash-generative operating profile.

Name

Retarus

Legal name

retarus GmbH

Website

https://retarus.com

Company type

Private

Founded year

1992

Operating status

Operating

Headcount range

251–500 employees

Short description

Retarus is a Munich-based, privately held cloud communications provider founded in 1992, serving global enterprises with cloud fax, transactional email, enterprise SMS, email security, and business process automation across healthcare, finance, logistics, and manufacturing sectors.

Ownership category

akta.pro rank

Headquarters

HQ city

Munich

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Software

Cost components

Technology or R&D, Personnel, Infrastructure, Marketing or Sales, Operations

Revenue model

1. Cloud Fax Services: Usage-based billing model for cloud fax services, charging on batch and page prices (pay-per-use), eliminating CAPEX for hardware, software, maintenance, licenses, and fax lines.
2. Transactional Email: Consumption-based pricing for email delivery services with guaranteed throughput rates and high inbox placement.
3. Enterprise SMS: Usage-based SMS messaging with billing codes for transparent cost center allocation and enterprise-grade features.
4. Email Security: Subscription-based security services including Secure Email Gateway, Advanced Threat Protection, Encryption, and Archive services.
5. Business Process Solutions: Cloud EDI, E-Invoicing, and Intelligent Document Processing services with scalable, usage-based or subscription pricing.

Pricing tiers

Go-to-market motion4 records

Distribution channels6 records

Marketing channels9 records

Core offering

Retarus is a Munich-based cloud enterprise communication platform that delivers business-critical Cloud Fax, Transactional Email, and Enterprise SMS services, complemented by Email Security (Secure Email Gateway and ICES API for Microsoft 365) and Business Process Solutions (Cloud EDI, Global E-Invoicing, and Intelligent Document Processing). All services are operated from Retarus-owned global data centers, are API-first, and are integrated natively with SAP, Microsoft 365, Epic/Cerner, and Salesforce. The offering targets large enterprises in healthcare, logistics, financial services, and manufacturing requiring HIPAA/GDPR-compliant, high-throughput transactional messaging.

Product overview

Retarus is a cloud-based enterprise communication platform offering a portfolio of five core messaging products: Cloud Fax, Transactional Email, Enterprise SMS, Email Security, and Business Process Solutions. These core products are complemented by modular add-on features (Advanced Threat Protection, Sandboxing, Post-Delivery Protection, Email Continuity, Email Encryption, Email Archive, Policy Engine) and specialized sub-products including Intelligent Document Processing, Intelligent Capture Services, Cloud EDI Gateway, WebConnect for Suppliers, and Global E-Invoicing. Integration layers provide native connectivity to SAP environments, Microsoft 365 ecosystem (including Outlook, Power Platform, and Teams), healthcare EHR systems (Epic, Cerner), CRM platforms (Salesforce), and e-commerce platforms. The platform is delivered via Retarus-owned global data centers with REST/SMTP/SFTP APIs, supports MCP for AI tool integration, and is backed by security certifications including ISAE 3402 Type II, PCI DSS, HIPAA, and GDPR compliance.

Differentiator

Problem solved

Functional benefit

Brands

• Cloud Fax: Enterprise-grade cloud fax services for business-critical communication needs.
• Transactional Email
• Enterprise SMS
• Email Security
• Business Process Solutions
• Enterprise Fax Portal
• WebExpress

Products and services

• Cloud Fax Enterprise-grade cloud fax service that delivers business-critical fax communication without internal fax infrastructure, offering unlimited capacity, OCR/barcode smart routing, native fax APIs, gateways, and worldwide telephone number service for enterprises that need reliable, compliant fax from business applications.
• Transactional Email High-performance transactional email delivery service with guaranteed throughput rates and high inbox placement, designed for business applications sending order confirmations, shipping notifications, password resets, and other high-volume application-generated emails.
• Enterprise SMS Scalable, enterprise-grade SMS messaging service for sending text messages worldwide with Email-to-SMS, SMS-to-Email, billing codes, UTF-16 encoding, DirSync for Active Directory, and direct API integration, used for delivery alerts, IT alerting, and customer engagement by enterprises.
• Email Security Comprehensive email security solution made in Europe offering a Secure Email Gateway and Integrated Cloud Email Security (ICES) API for Microsoft 365, including Advanced Threat Protection, Sandboxing, Post-Delivery Protection, Email Continuity, Email Encryption, and Email Archive.
• Business Process Solutions Suite of solutions for securely automating business processes and integrating partners, including Cloud EDI Gateway, WebConnect for Suppliers, Global E-Invoicing, Intelligent Document Processing (OCR/ICR/IDR), and Intelligent Capture Services, used to automate document exchange with suppliers, customers, and ERP systems.
• Enterprise Fax Portal Web-based portal for Cloud Fax users to send, receive, and process critical documents in the browser with collaborative workflows, real-time visibility, and maximum control over fax communication, including the new Delivery Assist capability.
• WebExpress Multichannel messaging solution allowing users to send messages via email, fax, or SMS directly from a web browser, positioned as a self-service multichannel option used by both enterprises and non-profits such as Ambulance for Kids.
• Intelligent Document Processing AI-powered document processing service using OCR, ICR, and IDR to automatically capture, read, and convert unstructured documents (such as inbound faxes) into structured data for ERP system integration, eliminating manual data entry and reducing errors.
• Cloud Fax App for Salesforce Native Salesforce app integrating cloud faxing into Sales Cloud, Service Cloud, and Health Cloud on desktop and mobile, distributed via the Salesforce AppExchange and AgentExchange marketplaces.
• Cloud EDI Gateway Electronic data interchange (EDI) gateway providing cloud-based EDI capabilities for supply chain communication with trading partners, used as part of the Business Process Solutions suite.
• Global E-Invoicing Component of Business Process Solutions supporting international e-invoicing compliance and transmission across regulatory jurisdictions for B2B invoicing requirements.
• WebConnect for Suppliers Supplier-facing web portal component of Business Process Solutions that enables suppliers to exchange documents and data with the enterprise without requiring their own EDI infrastructure.

Quantifiable outcome

• 30% reduction in operating expenses by eliminating hardware, maintenance, and licensing costs
• +2 more outcomes

Named customers10 records

Segments5 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Integration16 records

AI capability4 records

Feature10 records

Partnerships

One partnership is on record.

• SalesforcecoreTechnology or IntegrationRetarus Cloud Fax App for Salesforce provides native fax integration within Sales Cloud, Service Cloud, and Health Cloud on desktop and mobile. Available on Salesforce AppExchange (AgentExchange), supporting a broader range of Salesforce-driven processes with version 2.2 extending to additional business processes.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Esker: Cloud document process automation and e-invoicing vendor; overlaps with Retarus Business Process Solutions, Global E-Invoicing, and SAP integration capabilities.
• MessageBird: European-headquartered cloud messaging platform competing in enterprise SMS, transactional email, and omnichannel communications — overlapping Retarus's EMEA enterprise focus.
• Tungsten Automation (Kofax): Document capture and intelligent document processing vendor; comparable to Retarus IDP and Intelligent Capture Services, particularly for SAP and enterprise document automation.
• eFax (Consensus/j2 Global): Cloud fax pioneer competing directly in digital fax for business-critical document transmission; overlaps with Retarus's cloud fax and enterprise customer base.
• OpenText (XMedius/Easylink): Enterprise cloud fax and secure messaging provider, comparable to Retarus Cloud Fax with similar enterprise healthcare and B2B integration focus.

Broad incumbents

• Sinch: Global cloud messaging provider with enterprise SMS, email, and messaging APIs; comparable customer base (enterprise/regulated) and overlapping product offerings with Retarus.
• Proofpoint: Enterprise email security and compliance vendor; competes in Secure Email Gateway, Advanced Threat Protection, and Email Archive — directly overlapping Retarus Email Security.
• Twilio: Cloud communications platform offering transactional email, SMS, and APIs at scale; competes with Retarus Transactional Email and Enterprise SMS lines, particularly in developer/enterprise API use cases.
• Symantec/Broadcom Email Security: Large incumbent offering enterprise email security, threat protection, and archiving; competes in the same Secure Email Gateway and compliance-driven deals as Retarus Email Security.

Emerging players

• Egress: Email encryption and data loss prevention vendor; comparable to Retarus Email Encryption and Post-Delivery Protection within Microsoft 365 environments.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/retarus
• LinkedInlinkedin.com/company/retarus

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Retarus