Retarus GmbH is an international information and communication technology company headquartered in Munich, Germany. Founded in 1992 by Martin Hager, who remains the CEO, Retarus is privately owned and has grown into a leading provider of secure, high-performance cloud-based communication solutions for business-critical processes. The company specializes in enterprise cloud solutions for messaging, email security, fax, SMS, and business integration, serving over 4,500 companies worldwide with a workforce of over 460 employees from more than 30 nations. Retarus operates 19 offices and 7 data centers on 4 continents, emphasizing GDPR compliance and in-house technology development.
Retarus was founded in 1992 in Munich. Early innovations included hosted fax and email security services launched in the early 1990s, followed by SMS services in 2001. The company expanded internationally with data centers in Asia and Australia in 2015, and subsidiaries in Romania (2019) and Portugal (2021). Retarus has maintained steady growth, with revenues surpassing €70 million in 2024 and a workforce increasing over 10% annually, reflecting strong demand for digital communication solutions accelerated by regulatory requirements such as GDPR and remote work trends.
The company reported revenues of around €70 million in 2024 and sustained growth over multiple years, indicating a solid financial position. The company invests approximately 7.5% of profits into research and development, underscoring its commitment to innovation.
Messaging Services: Fax, SMS, and email messaging with high throughput and reliability.
Email Security: Enterprise-grade email security with compliance to HIPAA, PCI DSS, GDPR, and other standards.
Business Integration: APIs and gateways for seamless integration with enterprise applications like SAP, Exchange, and Office 365.
Cloud Fax: Scalable, secure fax services without hardware or software installation.
SMS Services: Global SMS delivery with special regional features and high reliability.
Business Continuity: Redundant, Tier 4 data centers with hot/hot design ensuring uninterrupted service.
Retarus has engaged in acquisitions. Instead, the company focuses on organic growth and continuous product innovation through in-house development. Recent expansions include establishing new subsidiaries and partnerships, such as the 2022 collaboration with DE-CIX to offer private direct cloud connections bypassing the public internet, enhancing security and performance
Recent innovations include advanced cloud fax functionalities tailored for demanding use cases, enhanced SMS services with reliable global delivery, and state-of-the-art WebConnect technology for business integration. Retarus continuously updates its platform without maintenance windows, ensuring uninterrupted service and rapid deployment of new capabilities.
Retarus emphasizes professionalism, appreciation, and cultural and human values in its operations. The company is committed to delivering excellent customer experiences with high-quality service, supported by 24/7 multilingual technical support. Its workforce stability is notable, with an average employee tenure exceeding five years, reflecting a positive work environment. Retarus values innovation, dedicating a significant portion of profits to R&D, and maintains a customer-centric approach focused on reliability, efficiency, and compliance.
Retarus serves more than 4,500 customers worldwide, including enterprises, SMBs, and government agencies. Its client base spans multiple industries and regions, supported by localized offices and data centers ensuring compliance with regional data protection laws. The company’s solutions are trusted for critical communication needs, with a focus on transparency, security, and business continuity. Retarus maintains active engagement with its users through dedicated channel partner teams and global sales and support networks.
