Top 10 eFax & Fax Server Software: Features, Pros, Cons & Comparison

Posted on March 17, 2026March 17, 2026 | by khushboo

Introduction

eFax and Fax Server software represent the modernization of a legacy communication standard, transitioning physical hardware into secure, cloud-based, or virtualized digital workflows. These platforms allow organizations to send and receive faxes via email, web portals, mobile apps, or direct API integrations, effectively eliminating the need for traditional fax machines and dedicated analog phone lines. Enterprise environment, these tools are not merely about convenience; they are critical components of secure document transmission, particularly in highly regulated industries like healthcare, legal, and finance where digital signatures and audit trails are mandatory.

The shift toward digital faxing is driven by the need for centralized administration, reduced operational costs, and enhanced security. Unlike traditional faxing, modern server software encrypts documents at rest and in transit, providing detailed logs that are essential for meeting stringent global data protection standards. When evaluating these solutions, decision-makers must prioritize high-volume reliability, the quality of Optical Character Recognition (OCR) for document indexing, and the depth of integration with existing Enterprise Resource Planning (ERP) and Customer Relationship Management (CRM) systems.

Best for: Healthcare providers, legal firms, government agencies, and financial institutions that require high-security, high-volume document exchange with a verifiable audit trail.

Not ideal for: Small teams with extremely low document volume who can rely on standard secure email or occasional walk-in retail fax services.

Key Trends in eFax & Fax Server Software

AI-Powered OCR and Data Extraction: Modern servers use machine learning to automatically read incoming faxes, extract key data points, and route them to the correct department or database.
Hybrid Cloud Deployments: Organizations are increasingly adopting models where sensitive data is processed on-premise while leveraging the cloud for global delivery and scalability.
API-First Architectures: The focus has shifted toward headless faxing, where the service is integrated directly into medical or legal software via RESTful APIs.
Blockchain-Verified Audit Trails: To ensure non-repudiation, some high-end servers are implementing distributed ledger technology to timestamp and verify fax delivery.
Enhanced Mobile Productivity: Mobile-first faxing allows professionals to scan, sign, and send documents from a smartphone camera with the same security as a desktop terminal.
Interoperability with Digital Health Records: In healthcare, the focus is on converting incoming faxes into HL7 or FHIR-compatible data formats for seamless medical record updates.

How We Selected These Tools (Methodology)

Reliability and Uptime: We prioritized software with proven track records for handling high-volume surges without dropped transmissions or server latency.
Security Frameworks: Every tool was evaluated on its encryption standards, including support for TLS and AES-256 protocols.
Compliance Certification: We looked for solutions that explicitly support industry-specific regulations such as HIPAA, GDPR, and SOX.
Ease of Integration: We weighed the availability of pre-built connectors for platforms like Microsoft 365, Salesforce, and SAP.
Administrative Control: The ability to manage thousands of users, departments, and fax numbers from a single centralized dashboard was a key requirement.
Scalability: The tools must be capable of growing from a single-user setup to an enterprise-wide deployment with thousands of lines.

Top 10 eFax & Fax Server Software Tools

1. OpenText RightFax

OpenText RightFax is widely recognized as the market leader for enterprise-grade fax server software. It provides a robust, highly scalable platform designed to integrate with a vast array of back-end systems and office applications.

Key Features

Deep integration with ERP systems like SAP and Oracle.
Advanced document tracking and comprehensive audit logs.
Support for both on-premise and hybrid cloud environments.
Specialized connectors for multi-function printers (MFPs).
Automated inbound routing based on DID or caller ID.

Pros

Exceptional reliability for mission-critical high-volume faxing.
Most extensive feature set for large-scale enterprise administration.

Cons

Significant initial investment and maintenance costs.
Requires specialized knowledge for complex configurations.

Platforms / Deployment

Windows Server / Virtualized / Hybrid
On-premise or Private Cloud

Security & Compliance

AES-256 encryption, TLS 1.2+, HIPAA, and PCI-DSS.
Secure FOIP (Fax over IP) capabilities.

Integrations & Ecosystem

The strongest ecosystem for enterprise software.

Microsoft SharePoint
Salesforce
SAP / Oracle
Epic / Cerner (Healthcare)

Support & Community

Extensive global partner network and 24/7 dedicated enterprise support tiers.

2. eFax Corporate

eFax Corporate is the cloud-based standard for businesses looking to eliminate hardware entirely. It focuses on high-compliance digital faxing delivered via a secure SaaS model.

Key Features

Secure fax-to-email using TLS encryption.
Cloud storage integration for archiving documents.
Mobile application for on-the-go document management.
Electronic signature toolset built directly into the portal.
High-volume “Fax Broadcast” capabilities for mass alerts.

Pros

No hardware or software installation required.
Predictable monthly subscription model for better budgeting.

Cons

Costs can scale quickly for extremely high-volume users.
Less customization compared to a dedicated on-premise server.

Platforms / Deployment

Web / iOS / Android / Windows / macOS
Pure Cloud (SaaS)

Security & Compliance

HITRUST CSF Certified, HIPAA, and GDPR compliant.
Encrypted at-rest and in-transit storage.

Integrations & Ecosystem

Designed for modern cloud productivity.

Microsoft 365
Google Workspace
Slack
Dropbox

Support & Community

Strong customer success teams and detailed online training modules for users.

3. XM Fax (by OpenText)

XM Fax is a high-performance Fax over IP (FoIP) solution that excels in virtualized environments. It is known for its agility and modern web-based interface.

Key Features

Software-based FoIP that eliminates the need for fax boards.
Multi-tenant architecture for service providers or large conglomerates.
Extensive web-based administration dashboard.
Print-to-fax drivers for desktop integration.
Comprehensive API for custom application development.

Pros

Highly efficient in VMware and Hyper-V environments.
Very user-friendly interface for end-users.

Cons

Pricing is competitive but can be complex depending on modules.
Requires a stable VoIP/SIP infrastructure for best results.

Platforms / Deployment

Windows Server / Virtualized
On-premise / Hybrid / Cloud

Security & Compliance

FIPS 140-2, HIPAA, and GDPR.
Secure archiving and deletion protocols.

Integrations & Ecosystem

Broad compatibility with modern communication platforms.

Cisco Unified Communications
Avaya
Microsoft Teams
Xerox / HP MFPs

Support & Community

Solid documentation and a reliable global reseller support network.

4. Biscom Fax

Biscom is a veteran in the secure document delivery space, offering a fax server that is favored by large government and financial institutions for its “security-first” architecture.

Key Features

Support for both fax and secure large-file transfer.
Robust failover and disaster recovery configurations.
Specialized OCR for automated data capture.
Advanced rule-based routing and workflow automation.
Hybrid cloud options for data sovereignty.

Pros

Extremely secure; often used in the most sensitive environments.
Handles large file attachments more gracefully than competitors.

Cons

Interface can feel slightly more traditional than newer SaaS tools.
Premium pricing reflects its high-security positioning.

Platforms / Deployment

Windows / Linux / Virtualized
On-premise / Cloud / Hybrid

Security & Compliance

SOC 2, HIPAA, FERPA, and FIPS-validated encryption.
Detailed activity logs for regulatory audits.

Integrations & Ecosystem

Strong ties to enterprise content management.

OpenText Content Suite
IBM FileNet
Microsoft Office
Electronic Health Records (EHR)

Support & Community

Highly rated domestic technical support and professional consulting services.

5. mFax (by DocuSign)

mFax is a modern, cloud-native faxing platform that prioritizes a clean user experience and robust API capabilities. It is widely considered one of the most reliable SaaS fax options.

Key Features

Modern, intuitive web interface.
Developer-friendly REST API with clear documentation.
Advanced user management with hierarchical permissions.
Real-time delivery tracking and notifications.
Built-in document editing and annotation.

Pros

Very fast setup process for teams of any size.
High deliverability rates due to a proprietary carrier network.

Cons

Lacks some of the legacy on-premise hardware integrations.
Focused primarily on cloud-native workflows.

Platforms / Deployment

Web / Mobile
Cloud (SaaS)

Security & Compliance

HIPAA, GLBA, and SOX compliant.
AES-256 bit encryption at rest.

Integrations & Ecosystem

Focused on modern software stacks.

Zapier
Salesforce
Slack
Google Drive

Support & Community

Responsive 24/7 support and an active developer community.

6. GFI FaxMaker

GFI FaxMaker is a popular choice for small to mid-sized businesses that need a reliable fax server that integrates directly with their existing email environment.

Key Features

Seamless email-to-fax and fax-to-email.
Support for digital over IP (FoIP) or traditional hardware.
Automated document archiving for legal compliance.
Inbound routing via OCR or DTMF.
Simple reporting tools for usage tracking.

Pros

Cost-effective for companies with moderate faxing needs.
Very easy to manage for IT generalists.

Cons

Not as scalable for the largest global enterprises.
Some features require additional third-party modules.

Platforms / Deployment

Windows Server
On-premise / Cloud

Security & Compliance

TLS encryption and secure archiving.
Supports HIPAA compliance efforts.

Integrations & Ecosystem

Strong focus on the Microsoft ecosystem.

Microsoft Exchange
Outlook
SQL Server
Active Directory

Support & Community

Well-established support forum and broad knowledge base.

7. Esker Fax

Esker Fax is an automated fax server solution that is often part of a larger business process automation suite, focusing on document delivery for finance and supply chain.

Key Features

Cloud-based global delivery network.
Direct integration with ERP applications for automated invoicing.
Real-time tracking of every sent document.
Multi-language support for global deployments.
Automated retries and fallback routing.

Pros

Ideal for automating outbound business documents.
Reduces manual handling of invoices and purchase orders.

Cons

Best when used as part of the broader Esker automation platform.
May be overly complex for simple, ad-hoc faxing.

Platforms / Deployment

Cloud / Hybrid
SaaS

Security & Compliance

SOC 1 & SOC 2, HIPAA, and ISO 27001.
End-to-end encrypted delivery.

Integrations & Ecosystem

Built for the enterprise back-office.

SAP
Microsoft Dynamics
Oracle
JD Edwards

Support & Community

Professional global implementation teams and 24/7 technical assistance.

8. Concord Cloud Fax

Concord is a enterprise cloud fax provider that prides itself on “untethered” reliability, specifically designed for high-volume users who cannot afford downtime.

Key Features

Proprietary IP-based transmission protocol.
Extensive reporting and analytics dashboard.
No-software installation for end-users.
Advanced “Retry” logic to ensure delivery over noisy lines.
Secure web portal for document management.

Pros

Exceptional success rates for complex, multi-page faxes.
Highly secure and easy to scale without hardware.

Cons

Pricing is geared toward high-volume enterprise users.
Limited on-premise hardware integration.

Platforms / Deployment

Web-based
Pure Cloud

Security & Compliance

PCI-DSS, HIPAA, and SOC 2.
Encrypted storage with user-level access controls.

Integrations & Ecosystem

Focused on healthcare and financial data flows.

Salesforce
Workday
Epic
Various specialized APIs

Support & Community

Dedicated account managers and technical onboarding specialists.

9. Retarus Cloud Fax

Retarus provides a high-performance global messaging platform that includes fax as a core component, specializing in massive throughput for global enterprises.

Key Features

High-speed parallel processing for bulk faxing.
Global compliance and local data residency options.
Intelligent routing based on destination country.
Integration with enterprise email and applications.
Real-time status tracking via API.

Pros

Best-in-class for global companies with distributed offices.
Handles sudden spikes in volume without degradation.

Cons

More complex to set up for small, simple teams.
Geared heavily toward the industrial and corporate market.

Platforms / Deployment

Cloud-native
SaaS

Security & Compliance

GDPR, HIPAA, and local European data protection laws.
Secure data centers with high-availability.

Integrations & Ecosystem

Excellent for large-scale application integration.

SAP (Certified)
Microsoft 365
HCL Notes
Custom REST APIs

Support & Community

Global support in multiple languages and strategic consulting.

10. Fax.plus

Fax.plus is a modern, high-security cloud faxing service that emphasizes ease of use and cross-platform accessibility for businesses of all sizes.

Key Features

Highly rated mobile apps and web interface.
Slack and Google Workspace integrations.
Ability to sign documents directly in the app.
Support for porting existing fax numbers.
Slack notification system for incoming faxes.

Pros

Most modern and sleek user interface in the category.
Very affordable for small businesses and growing teams.

Cons

Fewer “deep” ERP integrations than OpenText or Esker.
Primarily designed for cloud-first workflows.

Platforms / Deployment

Web / iOS / Android / macOS / Windows
Cloud (SaaS)

Security & Compliance

SOC 2, HIPAA, and ISO 27001.
Data residency options to choose where faxes are stored.

Integrations & Ecosystem

Strongest in the modern SaaS productivity stack.

Google Workspace
Microsoft 365
Slack
Zapier

Support & Community

Excellent online help center and fast email-based support.

Comparison Table

Tool Name	Best For	Platform(s) Supported	Deployment	Standout Feature	Public Rating
1. RightFax	Global Enterprise	Win Server, Virtual	On-prem/Hybrid	ERP Integration	N/A
2. eFax Corp	Cloud Compliance	Web, Mobile, PC	SaaS	HITRUST Certification	N/A
3. XM Fax	Virtualized Ops	Win Server, Virtual	Hybrid	FoIP Performance	N/A
4. Biscom	Govt/Finance	Win, Linux, Virtual	On-prem/Hybrid	File & Fax Hybrid	N/A
5. mFax	Developer-first	Web, Mobile	SaaS	REST API Depth	N/A
6. GFI FaxMaker	SMB Email Fax	Win Server	On-prem	Email Client Native	N/A
7. Esker Fax	Supply Chain	Cloud	SaaS	Automated Invoicing	N/A
8. Concord	High Reliability	Web-based	Pure Cloud	Delivery Success Rate	N/A
9. Retarus	Global Bulk Fax	Cloud-native	SaaS	Global Hub Architecture	N/A
10. Fax.plus	Modern Teams	Web, Mobile	SaaS	UI & UX Simplicity	N/A

Evaluation & Scoring of eFax & Fax Server Software

Tool Name	Core (25%)	Ease (15%)	Integrations (15%)	Security (10%)	Performance (10%)	Support (10%)	Value (15%)	Weighted Total
1. RightFax	10	4	10	9	10	9	6	8.45
2. eFax Corp	8	9	8	10	8	8	7	8.15
3. XM Fax	9	7	8	8	9	8	8	8.20
4. Biscom	9	5	7	10	9	9	7	7.85
5. mFax	8	10	9	9	8	8	9	8.70
6. GFI FaxMaker	7	8	8	7	7	8	9	7.55
7. Esker Fax	8	6	9	9	8	8	7	7.65
8. Concord	8	8	8	9	10	8	7	8.15
9. Retarus	9	6	9	9	10	8	7	8.15
10. Fax.plus	7	10	8	9	7	8	10	8.20

This evaluation highlights that the “best” tool is heavily dependent on the deployment model. OpenText RightFax scores highest for technical depth and integration, while mFax and Fax.plus dominate in ease of use and modern value for cloud-centric companies.

Which eFax & Fax Server Software Tool Is Right for You?

Solo / Freelancer

For individuals, Fax.plus is the most logical choice. Its mobile app allows you to handle faxes like emails, and its “Pay-as-you-go” or low-tier monthly plans are very cost-effective for low volume.

SMB

Small to mid-sized businesses looking for an easy transition should choose mFax or GFI FaxMaker. mFax is better for those moving to a modern cloud-first stack, while FaxMaker is ideal for teams that want to keep faxing strictly within their Outlook or Exchange environment.

Mid-Market

Organizations with more complex departmental needs should evaluate eFax Corporate or XM Fax. eFax Corp provides the necessary compliance without the IT burden, whereas XM Fax offers more control if the company maintains its own virtual servers.

Enterprise

For global enterprises with high-volume, automated workflows (like insurance claims or banking), OpenText RightFax or Retarus are the standard. They offer the necessary horsepower to process thousands of pages per hour and the depth to integrate with SAP or Oracle.

Budget vs Premium

Fax.plus and GFI FaxMaker represent the best value for limited budgets. OpenText RightFax and Biscom are premium solutions where you are paying for extreme security, customization, and dedicated enterprise support.

Feature Depth vs Ease of Use

RightFax offers the most depth but requires significant training. mFax offers a “pick up and use” experience that requires almost no user onboarding while still providing a robust API for technical teams.

Integrations & Scalability

OpenText RightFax and Esker Fax lead in integration depth, particularly with legacy and enterprise ERP systems. For cloud-to-cloud scalability, Concord Cloud Fax and Retarus provide the most resilient global networks.

Security & Compliance Needs

If your industry requires the absolute highest security (e.g., Defense or high-stakes Legal), Biscom and eFax Corporate are the leaders. They maintain the most rigorous certifications and have been vetted by the world’s most sensitive organizations.

Frequently Asked Questions

What is the difference between an eFax and a Fax Server?

An eFax is a cloud-based service that sends/receives faxes via email or web. A Fax Server is software that manages those transmissions, often integrated with a company’s local network or ERP systems.

Is eFax more secure than traditional faxing?

Yes, because digital faxes are encrypted during transmission and storage, and they don’t sit on an open paper tray for unauthorized eyes to see.

Can I keep my current fax number?

Yes, most providers on this list allow for “Porting,” where you move your existing analog or digital fax number to their service.

Do I need a phone line for eFax?

No, these services use your internet connection (FoIP) or a cloud-based gateway to transmit data, eliminating the need for analog copper lines.

How does email-to-fax work?

You simply compose an email, attach the document, and in the “To” field, you enter the recipient’s fax number followed by the provider’s domain (e.g., 1234567890@efax.com).

What is FoIP?

FoIP stands for Fax over Internet Protocol. It allows fax documents to be sent over the internet rather than over traditional public switched telephone networks.

Are these tools HIPAA compliant?

Many are, but you must ensure you have a Business Associate Agreement (BAA) with the provider and have configured the security settings correctly.

Can I fax from my smartphone?

Yes, cloud-based tools like Fax.plus, mFax, and eFax Corporate have dedicated mobile apps that use your camera as a scanner.

What happens to my faxes if the internet goes down?

Most cloud-based services will queue your incoming faxes in their secure portal, allowing you to access them as soon as you are back online.

Can I automate outbound faxes from my CRM?

Yes, using the APIs provided by tools like RightFax, mFax, or Retarus, you can trigger a fax to be sent automatically when a specific action happens in Salesforce or SAP.

Conclusion

The transition to modern eFax and Fax Server software is an essential step in digitizing the enterprise document lifecycle and ensuring long-term compliance and security. Whether your goal is to eliminate costly hardware maintenance or to build a fully automated, AI-driven document extraction pipeline, the right tool is defined by your specific volume and integration needs. Moving away from analog lines not only reduces costs but also provides the visibility and auditability required in today’s regulatory environment. To begin, identify your high-volume document workflows and shortlist two or three providers to test for deliverability and ease of integration within your current IT stack.