Native Fax APIs and Gateways for Cloud Fax That Solve Complex Challenges

Retarus Cloud Fax

Integrate Cloud Fax into your business using APIs, gateway or FTP. Consolidate and simplify fax communications across your entire organization.

Familiar, Open Standards

Use open APIs or our gateway to roll out Cloud Fax across broad application landscapes, communications infrastructures and digital workplaces.

Fully Customizable

Flexible configuration options, features, and add-ons let you tailor faxing to your needs. Developer-friendly with extensive documentation.

Interested in Native Connectors Instead?

Find out how we integrate faxing into Epic and SAP.

Rely on the Experts

You know your business, we know fax. Our experts help you scope your requirements and implement the right solution without disrupting operations.

Customer Ratings and Reviews

“"Our mail users have no troubles with using the processes related to Retarus. Releasing spam, maintaining personal black- and whitelists and understanding the need of an antispam/antimalware protection."”

Read full review IT Services, Management / Business Consulting

“In Retarus we have found a dependable partner for our email communications. Thanks to their reliable and innovative solutions, we are very well protected against any threats, both now and in the future.”

Read customer story Stefan Hopf, Head of Messaging and Collaboration, Continental AG

“Retarus Email Security is highly reliable and provides excellent detection rates.”

Read customer story Kurt Walther, Director Global IT and Business Intelligence, Puma AG

“Retarus is now so established at medbo that we simply think of you first whenever it comes to email. We get the impression that you all know what you’re doing.”

Read customer story Jürgen Schmalzbauer, Data Center Manager, medbo

“We were impressed by the short response times and the commitment of the Retarus technicians to troubleshooting.”

Read customer story Philipp Haag, Project lead, SRH IT Solutions

Which Cloud Fax Integration Works Best for Your Business?

Fax API & Gateways

Cloud Fax APIs

Integrate Cloud Fax into almost any cloud or on-premises application or ecosystem via open REST and SOAP APIs.

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Cloud Fax for Legacy Applications

Custom, homegrown, on-premises? Find out how Cloud Fax can be integrated into non-standard applications using FTP, APIs or others.

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Cloud Fax Gateway

Send and receive faxes directly via email – with any device or client. If APIs are not an option, use SMTP to integrate Cloud Fax into your applications.

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Uncertain about your organization’s needs?

Contact us to find out how we can help you define your needs and craft the best possible solution.

Contact us

Find Out More About Retarus Cloud Fax

Analyst Reports

Find out what leading international analyst firms such as Gartner and IDC have to say about Retarus.

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Product Documentation Center

Documentation, configuration and administration manuals, feature descriptions and more.

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API Knowledge Center

Find API descriptions, mock servers and more in our integration documentation for developers.

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Reliable Faxing and All IP

Ensure that you can continue to send and receive faxes after moving to an All IP environment.

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Frequently Asked Questions

Is the migration from fax servers to enterprise cloud fax difficult?

Not with us. Enterprises often have complicated requirements or critical processes that cannot be interrupted, but we have experience from thousands of successful cloud-based fax migrations with many of the world’s leading companies.

Can we keep our fax numbers?

Yes, for example by porting your numbers to us. Get in touch with us and we’ll help you find out which option works best for you.

Is Cloud Fax secure?

Yes. We operate under a strict data security framework, and our processes and data centers are audited annually. We hold certifications such as SOC2, ISO27001, HITRUST, and TX-RAMP. Our products are compliant with HIPAA, GDPR, NIST, FERPA, CCPA, and more. We can process all data locally and in coordination with your compliance requirements if necessary.

Where can I find out more?

Read our case studies and analyst reports. Check out our corporate blog and upcoming webinars, and feel free to book a demo. We’re always happy to help.