List of the Top 10 Mail Servers for Mac in 2025

XgenPlus stands out as the premier enterprise email solution, facilitating seamless communication and collaboration. It is recognized as the first IDN Email Server to offer EAI (Email Address Internationalization), allowing for linguistic email addresses, including those written in Hindi. This software is suitable for a variety of organizations, including enterprises, SMEs, public sector units, and government departments. It encompasses all essential functionalities such as POP, IMAP, webmail, calendars, contacts, SMS, scheduling, and security features. Among its notable features are: - IDN Email, the sole internationalized domain name email hosting server - Policies for automatic archival and email retention - Options to merge or de-merge email accounts - Group mail with tracking capabilities - Broadcast email functionality - Scheduling for email, SMS, and more The advantages of using XgenPlus include a reliable uptime of 99.99%, scalability to adapt to the evolving needs of your organization, and robust security with built-in anti-spam measures. Additionally, it offers 24x7 support through live chat, phone, and offline channels, along with easy data management and administrative control, ensuring efficient storage and organization for all users.

Discover reliable, enterprise-grade email, calendar, and collaboration solutions that fit your budget. Kerio Connect presents a wide array of features for communication and teamwork, eliminating the complexities and high expenses typically linked to other services. It offers an integrated experience that combines email with shared calendars, scheduling tools, contact management, tasks, notes, shared and public folders, along with instant messaging capabilities. Users can easily sync their emails to their favorite mobile devices via Microsoft ActiveSync. The Instant Messaging functionality supports XMPP, making it compatible with various third-party chat and IM applications across both desktop and mobile platforms. Setting up Kerio Connect is a breeze, taking only 10 minutes, after which users can begin working almost immediately. This solution can be implemented on-site or through cloud environments hosted by partners, catering to users on Mac, Windows, or Linux systems. Additionally, it ensures full support for Outlook on both Windows and Mac, along with compatibility for numerous other IMAP or POP-compliant email clients, providing flexibility and smooth integration for every user. Embrace a collaborative experience that is straightforward and efficient, allowing your team to focus on what truly matters.

Horde is recognized as the most flexible groupware solution available, serving as an excellent foundation for the creation of business productivity applications. It offers compatibility with a broader range of backends, including all major SQL, LDAP, IMAP, Sieve, SMTP, and caching platforms, surpassing any other open-source groupware alternative on the market today. Consequently, this allows for the effortless integration of your current user base without the need for them to recall additional passwords. The comprehensive feature set of Horde rivals that of leading enterprise email systems, providing exceptional functionalities that compete effectively with our core applications, including mail, calendar, and address book, while also shining in secondary applications like time tracking, wikis, and ticketing systems. Moreover, this adaptability guarantees that users can customize their experience according to their specific requirements, thus boosting overall productivity and user satisfaction. Ultimately, Horde's robust architecture and extensive functionalities make it a top choice for organizations looking to enhance their collaborative efforts.

The restrictions on relay functionality have been completely revamped to include a more intuitive interface that enhances user control over security protocols associated with relays. In addition, EIMS has introduced a proprietary Domain Name Resolver (DNR) that aims to rectify the shortcomings of the Open Transport DNR and offers better performance than the OS X DNR, although it does not yet support non-recursive DNS configurations. A new feature has been added with the inclusion of an SMTP Submit port, which operates by default on TCP port 587, effectively replicating the capabilities of the traditional SMTP port and proving especially advantageous for users whose internet service providers impose limitations on port 25. Users can now set a cap on the number of recipients allowed per email, and the previously compulsory Expand SMTP Addresses feature can now be turned off, marking a significant shift from EIMS versions 3.1 and earlier where it could not be disabled. Moreover, the SMTP server on both ports 25 and 587 is now capable of logging Telnet connections and identifying behaviors similar to port scanning, which significantly bolsters security monitoring functions. Overall, these enhancements are designed to empower users with improved flexibility and security in their email management, thus adapting to contemporary needs. This comprehensive update reflects a commitment to evolving user demands and technological advancements in email services.

Haraka excels in handling thousands of concurrent connections and is capable of processing a remarkable number of messages every second. Its development, rooted in asynchronous JavaScript, contributes to remarkable speed and efficiency for both Haraka and its plugins. With strong spam protection offered by various plugins, Haraka effectively operates as a filtering Mail Transfer Agent (MTA). It also serves as a Mail Submission Agent (MSA) on port 587, especially when paired with authentication and DKIM signing plugins. Unlike conventional mail servers such as Exchange or Postfix, Haraka is not intended to function as a mail storage system, Local Delivery Agent (LDA), or an IMAP server like Dovecot or Courier. Instead, it is frequently integrated with these systems to provide improved functionality. Haraka's built-in outbound mail delivery engine is designed for scalability, ensuring that messages intended for relaying through authentication plugins are efficiently processed and queued for delivery. Additionally, the plugin framework of Haraka facilitates easy extensions, making it a valuable supplement to traditional MTAs that may fall short in filtering capabilities, thereby improving the email management experience. This modular structure allows users to customize their email solutions to meet specific needs, ensuring flexibility in their configurations. In this way, Haraka not only enhances performance but also adapts to the diverse requirements of modern email systems.

OpenSMTPD is a free implementation of the SMTP protocol designed for email communication on the server side, adhering to the specifications outlined in RFC 5321 while also including various standard extensions. This software allows standard machines to engage in email exchanges with other systems that operate under the SMTP protocol. Created out of a need for a more effective alternative to existing email solutions, OpenSMTPD provides a thorough SMTP implementation. The project is primarily led by developers Gilles Chehade and Eric Faurot, with significant contributions from many OpenBSD developers and collaborators from diverse communities. The ongoing development of OpenSMTPD demonstrates a strong dedication to enhancing the functionality and reliability of email servers across multiple platforms. As a result, it has gained popularity among users seeking a robust and flexible email server solution.

Deliver powerful, enterprise-level email hosting to your clients along with a suite of advanced services. This exceptional solution is perfect for service providers, capable of supporting user bases ranging from thousands to millions. Draw in new customers by offering a high-quality email server that boasts remarkable flexibility, allowing for seamless integration with existing infrastructures. Manage your email communications effortlessly while coordinating calendars and syncing mobile devices, all backed by a secure and high-performing mail server. This service is suitable for organizations of all sizes. With Axigen's rich experience, delve into its array of features and choose those that align perfectly with your requirements. Streamline your email management and boost productivity using integrated calendars, to-do lists, and notes. Enjoy a desktop-like experience right in your web browser, enhanced by handy keyboard shortcuts, drag-and-drop functionalities, a dynamic email overview, quick access to frequently used folders, customizable filters, automated out-of-office replies, and personalized blacklist and whitelist settings for a customized email experience. This all-encompassing email hosting solution empowers users to work efficiently and effectively, regardless of their location, ensuring they remain connected and productive. Moreover, adopting this service can significantly enhance communication flow within teams and improve overall operational efficiency.

The absence of a traditional office is the sole guideline. Utilize TeamChat for collaborative project efforts, manage business communications via email, and engage in online meetings—everything is securely hosted in the cloud at a fraction of the usual cost. You can participate in group chats centered around specific projects, upload documents, and tag team members for focused discussions. Additionally, you can comment on emails shared by others and highlight crucial posts. The integration with email allows for seamless sharing of incoming messages directly into the TeamChat room to ensure your teammates stay informed. With a Desktop Client and Office document support for both Windows and Linux, your productivity can reach new heights. You have the flexibility to buy the full Suite or select only the applications that suit your needs. This innovative approach redefines the way teams can collaborate and work together efficiently.

The COVID-19 pandemic has profoundly altered how we live and work, leading to a surge in remote work that necessitates improved communication, collaboration, and flexibility. In this context, OpenText™ FirstClass® emerges as a comprehensive collaboration platform that enhances teamwork, facilitates communication, and provides easy access to resources and colleagues from any mobile device, ensuring that employees remain connected throughout the organization. FirstClass stands out as a solution that is not only cost-efficient but also adaptable and user-friendly, empowering individuals and teams to collaborate effectively toward common goals while fostering a shared sense of mission and introducing innovative engagement strategies. Tailored specifically for collaboration, it offers secure communication, mobile accessibility, numerous customization options, seamless integration with other tools, and reliable archiving, making it a vital resource for organizations navigating the intricacies of contemporary work dynamics. Moreover, the intuitive interface and extensive features of FirstClass contribute to smoother workflows, thereby boosting overall productivity and strengthening team unity. Ultimately, adopting such platforms can significantly influence an organization's ability to thrive in a rapidly changing environment.

Our all-encompassing Unified Communications solution is built upon the robust CommuniGate Pro platform. This advanced system promotes extensive Unified Communications through open APIs, enabling seamless integration with a wide array of business applications. Designed to accommodate hundreds of millions of accounts, CommuniGate Pro is ideal for large-scale alert systems, multimodal communications in web-based applications, or highly secure network infrastructures. Notably, this remarkable scalability is achieved without sacrificing efficiency or reliability; the platform is notably agile and adept at supporting resilient applications in both military and embedded environments. Moreover, CommuniGate Pro has garnered approval for use by government entities in Europe and the USA, further solidifying its credibility. Its outstanding stability, with uptimes comparable to VMS, has made it a preferred choice among military, transportation, and research organizations. Additionally, the platform empowers banks to manage email services for millions of clients while adhering to regulatory requirements. The server's signaling functionalities can also be effectively integrated into hybrid systems, amplifying its versatility even more. Ultimately, this positions CommuniGate Pro as a leading solution for organizations aiming to enhance and optimize their communications infrastructure while maintaining a high standard of reliability. With its multifaceted capabilities, it stands out as an indispensable asset in today’s rapidly evolving digital landscape.