Top 31 Email Client Software SaaS Companies in May 2026

Sofia, Unknown, Bulgaria

Businessmap is an enterprise agility platform that helps your entire company align on goals & deliver quality work faster. We offer the most flexible software platform for outcomes-driven enterprise agility. The unmatched functionality consolidates multiple tools into one, enabling affordable deployment at scale, visibility across all projects/portfolios and alignment on goals, to deliver quality work faster. Pairing it with the proprietary consulting program creates a tailored solution that ensures lasting value and exceptional ROI.

Herzliya, Israel

Spike is the AI-first inbox built for how modern professionals work—fast, fluid, and focused. We’ve redesigned email around chat-style conversations, layered with real-time AI that summarizes threads, drafts responses, and helps you get through your inbox faster. Spike unifies email, chat, video, docs, and tasks in one intelligent workspace—no more tab overload, no more context switching. From solo professionals to customer-facing teams, Spike replaces outdated inboxes and fragmented tools with one clean feed powered by the smartest AI in your inbox.

Modiin, Unknown, Israel

harmon.ie transforms Microsoft Outlook into a powerful hub for managing emails and documents across SharePoint, Teams, and OneDrive — without leaving your inbox. Trusted by thousands of organizations and a Microsoft award-winning partner, harmon.ie simplifies email and records management inside Microsoft 365. With harmon.ie, you can: Save emails and attachments to SharePoint or Teams with drag-and-drop Add metadata automatically or manually for easy classification Search across Microsoft 365 — directly from Outlook Reduce context switching and improve user adoption Strengthen compliance without extra training or disruption harmon.ie works entirely within your Microsoft 365 environment — keeping your data private, secure, and compliant. Whether you're using SharePoint Online, on-premises, or in a hybrid setup, harmon.ie makes everyday tasks faster, smarter, and easier to govern. 🏆 Microsoft Best App award winner 🔒 Built with security in mind — data stays in your tenant 🤝 A trusted Microsoft Partner for over a decade

Prague, Prague 8, Czech Republic

eM Client is a fully-featured email client for Windows, macOS, iOS and Android with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat. → support for all major services (including Gmail, Exchange, iCloud, and Outlook365) → automatic set up for most email services → simple and fast data import from all major email apps (including Microsoft Outlook, Outlook Express, Windows Mail, Thunderbird, Incredimail and more). → touch support for touch-enabled laptops, tablets and hybrid devices → super-fast search that finds any email, contact or attachment in seconds → Online Meetings support (for Zoom, MS Teams, Google Meet) → unique email features, such as Watch for Reply, Snooze Email, or Send Email Later → the interface is customizable in the most comprehensive way on the market (including custom themes and an advanced visual Theme Editor)

United States

Mailbird offers a Windows email client for managing multiple accounts.

Cheyenne, Wyoming, United States

AfterLogic Corporation is a web development company and agency. Since 2002 we created 20+ products including leading Afterlogic Webmail script, award-winning .NET/ActiveX Mailbee email components, open source Aurora Files, Aurora Corporate platform and many others. We are also professionals in custom web development services. We do projects in PHP, Laravel, Node.js, Vue.JS, KnockoutJS, LESS, etc. We have above 10,000 clients around the world, small companies and Fortune 500 ones, including Boeing, Volvo, CERN, NASA, Airbus, CISCO, Vodafone and many others (more see here https://afterlogic.com/clients).

Tallinn, Harjumaa, Estonia

Astonsoft focuses and develops know-how in information management tools. Our product portfolio consists of complete multi-user and cross-platform systems for both business and personal applications.

Hamburg, Germany

We are experienced systems, software and DevOps engineers dedicated to hosting sophisticated e-commerce projects. We work with highly available systems and services in our own data center infrastructures and in the cloud of Amazon Web Services. We have more than 15 years of experience in hosting and developing business-critical web applications in B2B and B2C. We sit in the heart of Hamburg’s Speicherstadt, a UNESCO World Heritage Site with a view over the canals, the harbor and the Elbphilharmonie concert hall. Premium Hosting With a hosting at Metaways you decide for a partner who competently accompanies and supports you and your technical service providers in all phases of your web project. Mass business is not ours, with us it is personal. We understand the importance of your project and rely on modern and highly available infrastructures and architectures with a comprehensive range of custom-fit services and solutions to contribute to your success. To this end, you will have dedicated contact persons who know your platform and its needs inside out: An experienced consultant/project manager in the phases of planning and technical realization, a system administrator in platform support, a service manager for change/service management, SLA reporting, elasticity planning and much more. We take it personally! Software Development Vibrant applications and stable systems – thanks to sophisticated deployment strategies and automatic testing. Your business application, regardless of whether it is a standard application or your own development, is in the best hands with us. Development, maintenance and expansion by experienced software engineers – and always according to current coding standards for stable, secure and sustainable software development. Would you like to talk? With pleasure! You can reach us at 040-31 70 31 65 or write to [email protected].

London, England, United Kingdom

Drag is the World's first all-in-one workspace in Gmail. One single place to support customers, manage tasks and close deals, from the place teams love: Gmail. Stop switching between tools and run your entire workflow from your inbox - where most things start and end. It's easy to install and easy to set up. No training required. 🥇 Featured in FastCompany, Inc. magazine, Mashable, Life Hacker and many others. 🥈 Techstars Backed Company. 🥉 Approved by Google security audit. ❤️ Trusted by 30,000+ professionals across 30+ countries. 📹 Watch our demo: https://www.dragapp.com/watch-demo/ 🚨 Browse Help Center: https://help.dragapp.com/en/ 👋 Speak to a Customer Champion: https://www.dragapp.com/demo/

United States

BlueMail is a free, beautifully designed, universal email client, capable of managing an unlimited number of mail accounts from various providers, allowing for smart push notifications and group emailing while enabling personalization across multiple email accounts. BlueMail is the perfect replacement for your stock email app. With a powerful unified account experience packaged in an intuitive and easy to use design, Blue Mail provides a top notch email service.