Citadel Mail Server alternatives

Ranked alternatives

1. 1
   
   IceWarp Mail ServerPaid

   IceWarp Mail Server is basically a professional-level webmail server for businesses and organizations. It is known to be one of the best, full-featured, and profitable webmail servers for the Windows and Linux operating systems. Its wide range of features and functionalities make it one of the best alternatives to the MS Exchange. This platform has got popularity because of the email management advantages and features, sharing of large size files, integration with MS Office suite, synchronization with MS Outlook, simple administration system, and much more.

   It is compatible with multiple email systems like IMAP, POP3, SMTP, POP TLS, ActiveSync, webmail system, etc. For the readers’ information, the standalone version of IceWarp Mail Server is a suite of multiple modules and each containing a set of core features with many possessing feature subsets as well.

   IceWarp Mail Server alternatives
2. 2
   
   SmarterMailFree

   SmarterMail is a next-generation email management server that is offering several business collaboration and communication features as well. This standalone program is basically the pack of scalable business management servers, real-time team collaboration, and group chat servers. It is designed to meet the business requirements of all types of businesses, from small to large size. The best about this platform is that it demands basic hardware requirements and offers superior stability with the least possible maintenance cost.

   Its wide range of email management functionalities is known to be one of the best alternatives to the MS Exchange Server. It allows its users to share messages and collaborate from any part of the world via the webmail interface. The other best thing about SmarterMail is that it is widely compatible with all types of email servers and email clients such as EAS, EWS, CardDAV, IMAP, POP, and much more.

   SmarterMail alternatives
3. 3
   
   Eudora Internet Mail ServerFree

   Eudora Internet Mail Server is a highly advanced internet mail system that supports all kinds of email systems and clients, including IMAP, POP3, SMTP, and much more. If you want to handle multiple email accounts to meet your clients’ demands, this is one of the best, reliable, and easy-to-use solutions for that purpose. For the information of the readers, it is entirely a commercial email management system that puts no limitation on the number of users to be used at a time.

   Users can add as many users as they want, and for each newly added user, they will get extra free email support. The highlighted features and functions of the Eudora Internet Mail Server are the availability of all kinds of host lists, built-in filters, new receive error logs, protection against attacks and distributed attacks, support of LDAP images, and much more. In a nutshell, Eudora Internet Mail Server is one of the best standard-based internet email servers.

   Eudora Internet Mail Server alternatives
4. 4
   
   Ipswitch IMail ServerFree

   Ipswitch IMail Server is widely known as the perfect alternative to the Windows email servers for its wide range of features and functions. This webmail server is the pack of multiple solutions in the shape of the hosted email system, secure instant messaging system, real-time collaboration, and much more. The best thing about this secure and all-in-one email server solution, is that it is backed by a professional resource center operated by a team of professionals.

   It is, in fact, a Windows Email Server that is particularly designed for small to medium-size business organizations. If you want to enjoy the advantages of an affordable, reliable, and hassle-free mail solution, then Ipswitch IMail Server is one of the best email management systems you could have.

   Ipswitch IMail Server alternatives
5. 5
   
   mailcowFree

   mailcow is one of the leading webmail server suites based on Postfix, Dovecot, and several other open-source software. It is basically based on a modern web-based user interface for administration and mail management purposes. It is now offering the multi self SAN, self-signed SSL certificate for all kinds of installed and supported services and makes it best for being used as a modern-day web management system.

   One of the best things about it is giving support for SQL databases and various other remote databases at the backend. Using this web manager, you can add as many domains as you want, you can add both aliases and mailboxes, the users can set limits, it is also possible to monitor mail statistics, can change the mail server settings, and can share and create and even delete the DKIM records and much more.

   mailcow alternatives
6. 6
   
   MDaemon Messaging ServerPaid

   MDaemon Messaging Server is known to be one of the best alternatives of the MS Exchange Server because of a wide range of functionalities in support for all kinds of email servers, featured webmail with spam protection, groupware, and much more. What makes it a special one is that it delivers a highly advanced and reliable performance via its user-friendly and featured rich design.

   For the information of the readers, it is entirely a commercial program. However, you can still enjoy the thirty-day free trial, and after getting satisfied, you can go on with the purchase. The users of the MDaemon Messaging Server can now get the next generation spam and antivirus protection for their MDaemon Messaging Server by keeping an eye on both ingoing and outgoing emails.

   MDaemon Messaging Server alternatives
7. 7
   
   Synovel CollabsuiteFree

   Synovel Collabsuite is a next-generation and open source web server for the Linux operating systems that now features the chat and support for the calendars. The best thing about it is that it now contains email archival, antivirus, and antispam qualities. Its advanced features make it one of the best internet mail servers for Linux operating system users. One of the best things about this tool is that it also allows its users to access all of its features via all access channels, either a smartphone, an online system, or via the desktop client.

   Moreover, all of these are synchronized with each other as well. That’s why most Linux users prefer to manage email accounts on a highly advanced email server. The main highlighted features and functions of the Synovel Collabsuite support all types of email services, contacts management, instant messaging, availability of a web-based administration panel, an archival system, advanced search system, and much more.

   Synovel Collabsuite alternatives
8. 8
   
   WinGate Mail ServerFree

   WinGate Mail Server is a platform that already integrates the comprehensive support for the IMAP4, SMTP, and POP3 mail services. Moreover, its latest version now provides support for multiple authentication options and offers secure connections for both reception and delivery of emails, and also allows the users to set up a secure email network system that remains accessible over multiple untrusted networks like the internet as well.

   Its simple yet powerful and flexible domain management system will allow you to set a comprehensive range of scenarios for the purpose of setting up domains, forwarding domains, and performing a wide range of various other management functions as well. Its recent version is now giving support for antivirus data scanning as well. The main highlighted features and functions of the WinGate Mail Server are attachment blocking system, support for SMTP and POP3 proxies, remote email queue management, support for antivirus data scanning, multiple authentication options, comprehensive message routing, and much more.

   WinGate Mail Server alternatives
9. 9
   
   Postfix Mail ServerFree

   Postfix Mail Server is an open-source and free mail transfer agent-based mail server that basically works routing and delivering emails. It is designed to be used as an alternative to Sendmail. The best about this platform is that it allows the IT administrator to combine this mail server with several other software that offers virus and spam filtering services. It also allows the users to add the features of message store access and get various other kinds of third-party supports.

   For the information of the readers, Postfix Mail Server offers a high-performance mail delivery system because it is an SMTP client. This advanced level of webmail server is combined with several mailing list software as well. Its architecture is very simple and packed with several server programs that keep themselves running in the background, and clients do the work normally at the front end. Each server running in the background basically handles the specific area of email delivery.

   Postfix Mail Server alternatives
10. 10
    
    Kerio ConnectFree

    Kerio Connect is a highly stable webmail server that aims to put businesses at ease. It has made the deployment and administration of multiple email accounts easy and simple. The best thing about this tool is that it offers support for all types of email accounts that can be accessed from a web browser.

    What makes it perfect for being used as the webmail server is that it has a meager licensing cost and delivers a stable and measurable business value compared to most webmail servers. Kerio Connect is offering full support and management for both Mac OS X and Windows operating systems users.

    Kerio Connect alternatives
11. 11
    
    MailEnableFree

    MailEnable is a Windows-based mail server packed with features and functions like antivirus and spam filtering, webmail management, cardDAV, CalDAV, and much more. Most of its features are similar to the MS Exchange Server. The best about this tool is that it is entirely compatible with most of the messaging and email services like POP3, IMAP, SMTP and offers various collaboration tools for better contacts and tasks management.

    This popular mail server offers state-of-the-art featured solutions for providing secure email and real-time collaboration services. Whatever the nature of your business is, MailEnable will always be there with all of its features and functions to offer you a solution to impress your mail users. It has now started offering support for MS Outlook, making it different from the rest of the email servers.

    MailEnable alternatives
12. 12
    
    AxigenPaid

    Axigen is a multifunctional email management server for both Windows and Linux operating systems. It is packed with the two basic functions of groupware and real-time collaboration. Moreover, the other features listed are the push email system, shared folder, PIM sync system, and outlook connector. It is simply the best and recommended mail server for small businesses because it combines integration projects and even tests environments. It is compatible with Windows and Linux-based operating systems that aim to offer both calendaring and real-time collaboration management.

    The best thing about Axigen is that it totally secure and scalable messaging and email management system. It is widely available for both businesses and service providers. With its usage, it will be easy for you to manage all of your emails, organize and share the calendars. It is suitable for the service providers and using this program. They can offer their customers an advanced level of email hosting service and security services based on various value-added services.

    Axigen alternatives
13. 13
    
    XeamsFreemium

    Xeams is a free email server management system that comes with the optional feature of spam filtering. It operates as a full server system and supports all email protocols, either POP3, IMAP, SMTP, or any other. Its spam firewall system is a highly advanced system that basically checks every inbound and outgoing email to protect the entire mailing system.

    It is a highly secure and robust email server for all types of operating systems, like Mac OS X, Windows, Linux, Solaris, or any UNIX-based operating system. The latest version of this tool contains a powerful and advanced junk and spam filtering engine that automatically wipe out almost all junk emails directly from the box. Overall, Xeams provides a highly flexible approach to the mailing system and making it a competent and user-friendly server.

    Xeams alternatives
14. 14
    
    NetWin SurgeMailPaid

    NetWin SurgeMail is a best in the class webmail server for all users, from beginners to professional ones. It is known as one of the fastest, robust, and fully-featured email secure servers that support almost all kinds of protocols and standards for its advanced functionalities and features. The best thing about it is that it is packed with its own designed web server. Rather than merely focusing on configuring it in the web server, the users are only required to install it on the system.

    The main advantages of this tool are that it is easy to manage, install the setup, advanced spam prevention, and virus filtering, availability of new SurgeWeb Ajax, Web2 web email interface, RFC standards-compliant, IMAP Mail Server, Linux Mail Server, Windows Mail Server, high-performance POP3 mail server, Windows & Linux SMTP server software, and much more. NetWin SurgeMail is a highly advanced and secure mail server designed to deliver a high level of security.

    NetWin SurgeMail alternatives
15. 15
    
    PowerMTAFreemium

    PowerMTA is highly advanced SMTP server software. It offers its users an unsurpassed delivery and reliability execution in a stable SMTP environment with granular connection controls. It contains those features and functions designed to address the challenges of digital messaging and all kinds of customer communications. It offers its users advanced and unsurpassed reliability and delivery execution in a stable SMTP environment with granular connection controls. It is one of the leading email gateway programs.

    It allows the users to easily adapt to the latest authentic specifications for sending volume emails and easily comply with all authentication policies prevailing in the industry. It is a recommended program for marketing and ESPs automation companies. It really provides a sophisticated solution for multi-stream delivery execution.

    PowerMTA alternatives
16. 16
    
    ArgoSoft Mail ServerFree

    ArgoSoft Mail Server is a best in the class webmail server that is basically the suit of multiple servers, FTP server, and various other forms of servers that allow the users to manage all of their servers. The best thing about this platform is that it offers full support for all types of protocols, including SMTP, ESMTP, POP3, and IMAP. It offers the complete delivery service via the smart server MX records and much more.

    Its main highlighted features and functions are support for unlimited users and domains, full support for SSL, TLS, SMTP, POP3, IMAP, completely transparent archiving of all type of messages, support for shared folders, support for anti-spam filters, native support for several other types of anti-spam and security features, support for delivery status notification, supports for secondary SMTP, blind to different IP addresses, ability to extend server using external server plugins, and much more. For the better management of the email server system, ArgoSoft Mail Server deploys the SQLite database engine, and for heavier loads, it deploys the MS SQL Server.

    ArgoSoft Mail Server alternatives
17. 17
    
    Poste.ioFree

    Poste.io is a fully-featured email server that offers support in the shape of an anti-SPAM system, webmail, and easy administration system. It is a mail server solution that is based on a system of open-source functionalities. Its wide range of functionalities and features includes a fully featured stack mail server solution that supports SMTP, IMAP, POP3, and various other email protocols.

    This entire system is designed to be used as default to start instantly without changing the internal environment of the system. For the information of the readers, the data in an email system has its own volume. Data and configuration are two things that are entirely separated from the binaries. The database of the users in the case of Poste.io is stored in the SQLite database. It delivers an advanced level of security system to its users.

    Poste.io alternatives
18. 18
    
    qmailFree

    Qmail is an advanced-level mail transfer agent for the UNIX-based operating systems. Security, performance, and simplicity are the three main highlighted features that make it the best option for using as a mail server management program. During the launch of its first version, this program was then known as a security-aware mail transport system, and after that, it started to get more features and functions.

    In contrast to most mail server programs, it has its own designed architecture made of various components. The other thing that makes it perfect for use as a mail server management system is that it offers advanced performance to the users by giving them support for bulk mail tasks like the availability of mailing list servers. In fact, this program was first designed to manage large mailing lists.

    qmail alternatives
19. 19
    
    ModoboaFree

    Modoboa is an open-source mail hosting and management platform designed to provide a secure and efficient experience for both system administrators and end-users. It offers IMAP/POP3/SMTP interconnection with any standard email client, as well as webmail access. You get a mail server with powerful anti-spam and anti-virus features and a powerful search engine for email content.

    You also get a user interface that allows users to manage your mailboxes as well as administer the local mail directory, including the system configuration. The Modoboa Client dashboard comes with a secure and efficient way to access your mailboxes from any standard email client. With its API, you can send and receive emails on any system. All in all, Modoboa is a great tool that you can consider among its alternatives.

    Modoboa alternatives
20. 20
    
    MailuFree

    Mailu is a mail server for docker images. It is a complete end-to-end mail server that can be deployed with one command. It manages email the moment it leaves the sender’s computer until it arrives at the recipient’s inbox. Mailu also provides a web interface for email management, a webmail interface, and a mail delivery agent. The goal is to provide the best possible mail experience while preserving the best practices for working with email.

    It provides all standard features of an MTA, such as client and server authentication, static and dynamic session caching with support for sessions expiring after some time, TLS encryption including STARTTLS support, SMTP transaction signing, and optional notifications when new mail arrives. It is designed to take advantage of modern cryptography libraries to provide transport layer security. Other features include handling multiple domains with a single server configuration, improving SMTP SSL encryption. All in all, Mailu is a great tool that you can consider among its alternatives.

    Mailu alternatives
21. 21
    
    EmailsFree

    Emails is a simple to use mail server for macOS that allows you to send and receive email messages. You can also configure it as your outbound email service, so all messages sent from your system will appear to come from either. Start the server with a simple switch and get notified if any error occurs. A server status indicator shows whether it’s offline or online. In order to add a new email address, enter the password to gain access via IMAP or SMTP. All in all, Emails is a great tool that you can consider among its alternatives.

    Emails alternatives
22. 22
    
    Mail-in-a-boxFree

    Mail-in-a-box is an open-source tool for making your own mail host server. This helps you run your own mail server, taking on the responsibility of receiving and forwarding mail and providing a reliable backup email address. As it takes more time to manage your emails and back them up, with your own mail-in-a-box server, you can set it and forget it. You will have full control of servers and don’t need to be an IT expert to handle the system.

    The tool also provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software. It also includes contacts and calendar synchronization. Another great feature is that it includes other standard mail functionality like spam filtering and greylisting, mail filter rules, email client auto-configuration, and automated backups. All in all, Mail-in-a-box is a great tool that you can consider among its alternatives.

    Mail-in-a-box alternatives
23. 23
    
    WildDuckFree

    WildDuck is a scalable, no-SPOF (single point of failure) IMAP/POP3 mail server. It is designed to be installed on commodity hardware and deliver robust email services with minimal input from system administrators. WildDuck has no configuration files. Instead, all configuration is done by setting environment variables in /etc/sysconfig/wildduck. It uses the STOMP protocol over WebSockets to post status updates to clients. The tool scales horizontally based on the number of CPUs available and can handle millions of users at tens of millions of messages per day.

    Moreover, it is designed to be run on dedicated hardware rather than virtual machines, which makes it more reliable. You can control each aspect with the REST API, which eliminates the need for configuration files. Another notable feature is the Application Specified Passwords, i.e., multi-factor authentication, which greatly enhances user experience in terms of security. All in all, WildDuck is a great tool that you can consider among its alternatives.

    WildDuck alternatives
24. 24
    
    Sanwhole ExchangePaid

    Sanwhole Exchange is a self-hosted mail server that provides a platform for people to easily send and receive email. The tool is fast, reliable, and secure without sacrificing performance or usability. It currently uses Postfix and Dovecot for internal mailing and POP/IMAP and LDA for groupware, hosted on a Debian machine. You can have free accounts but also have paid packages to suit individual needs.

    Additionally, Sanwhole Exchange also includes an alias system. The tool comes with a maintenance-free design, no professional maintenance required, no special training required. You also get complete web-based client access for controlling through a web browser. All in all, Sanwhole Exchange is a great tool that you can consider among its alternatives.

    Sanwhole Exchange alternatives
25. 25
    
    OX Open-XchangePaid

    OX Open-Xchange is a state-of-the-art international collaboration platform that interfaces with private and public networks. It helps you integrate emails, documents, social media, files, scheduling, etc., in one place. The tool contains all the tools necessary to create, manage, share, and interact in complex research projects in collaboration with your colleagues across borders. This powerful and easy-to-use collaboration environment improves your daily collaboration processes. OX Open-Xchange enables you to collaborate with your team of researchers, management, and customer groups on the basis of research projects either locally or across countries.

    No matter if it is a university project, a consulting project, or an industry project, you can get started without any problems thanks to an intuitive online user interface that helps you work efficiently and improve yourself more quickly your research results. Being an admin, you can also change or delete an account by accessing the user management menu, which you can find in your console menu. All in all, OX Open-Xchange is a great tool that you can consider among its alternatives.

    OX Open-Xchange alternatives
26. 26
    
    Postfix AdminFree

    Postfix Admin is an email server that supports SMTP, IMAP, POP3, and a web-based management interface that lets you manage your email. Not only that but it can also be used to manage alias and virtual domains, which is the feature that not every software offers. Some highlighting features include vacation messages to notify your current status, forwarding the domain to another, quota support, used quota display, fetch mail integration, user management dashboard for changing account info, command-line client CLI for advanced users, and Squirrelmail plug-in. All in all, Postfix Admin is a great tool that you can consider among its alternatives.

    Postfix Admin alternatives
27. 27
    
    MailpeoplePaid

    Mailpeople is an email marketing, ROI-optimized content marketing, and customer engagement platform. The tool is uniquely designed, facilitating marketers to manage their entire email marketing portfolio in one place. It allows you to build your own list of contacts, including email addresses for target groups, and create personalized content that is sent directly to subscribers based on personal data, such as interests and life events. This means that content can be built on a personal level and relate directly to subscribers’ lives and interests.

    You can easily design and promote your email campaigns using a comprehensive set of features, including digital postcards, PDFs, images, HTML pages, videos, and interactive forms. Moreover, you can track all your campaigns, see real-time statistics on campaign performance, view campaign analytics, and engagement metrics. Build their own list of contacts, including email addresses for target groups, and customize the content sent to subscribers based on personal data such as interests or life events. All in all, Mailpeople is a great tool that you can consider among its alternatives.

    Mailpeople alternatives
28. 28
    
    Mailcow: DockerizedFree

    Mailcow: Dockerized is a project to put an email server on the container system. It serves as a containerized, virtualized mail server that can be easily configured or migrated like any other Docker container. The biggest advantage is that you can use this email client with the same address book, no matter whether the emails are stored in a private data center or in a public cloud. Mailcow containers can run on any host but will save bandwidth and storage costs when run on a cloud server together with other containers.

    With this tool, you get a modern mail server that’s easy to set up and maintain. It’s ready to be used right after installation without complex configuration files or complicated commands that are difficult to understand. Spam filtering and virus scanning are included by default to make it more secure. All in all, Mailcow: Dockerized is a great tool that you can consider among its alternatives.

    Mailcow: Dockerized alternatives
29. 29
    
    Courier Mail ServerFree

    Courier Mail Server is an SMTP, POP3, and IMAP mail transfer agent with multiple extensions for extending its features and functions. The main extensions available on this platform are the spam filtering system and mailing list management system. The best thing about it is that it has the functions for providing immediate support to the main relay between the internet and internal LAN and can perform final delivery to the multiple mailboxes.

    It uses the advanced maildirs system as a platform for native storage format and can deliver mail to legacy mailboxes files. For the information of the readers, it also provides a lot of mail services for standard and regular operating system accounts. For the better assistance of email accounts, Courier Mail Server also offers mail services to almost all virtual mail accounts managed by multiple authentication databases. The Web-based configuration and administration tools make the Courier Mail Server one of the best options for being used as a webmail server.

    Courier Mail Server alternatives
30. 30
    
    EVO Mail ServerFree

    EVO Mail Server is a Windows-based mail server that gives its users full command and control over their organization’s messaging flow system. This tool is widely supported for all types of email clients and email servers. It offers many services in the shape of CardDAV and CalDAV services that work easily with all iOS devices. It now supports DNS and SMTP protocol for protection against all kinds of spam and viruses. For the better assistance of the users, it widely supports almost all operating systems and devices.

    EVO Mail Server is specially designed for users who want to monitor their email messages from a single platform. It assists the users to manage all of their account settings, file sharing across multiple departments, shared address books, and work easily with almost all email clients like Thunderbird and Outlook. In addition to specifying the user name, the user can specify the port domain or port number; it provides a certificate authentication option to enhance the advanced security level.

    EVO Mail Server alternatives
31. 31
    
    hMail ServerFree

    hMail Server is the best-in-the-class free and open source email server widely available for Windows operating systems. This email server basically contains multiple administration tools and functions for the management of email-related matters. This service is being used by many IT companies, internet service providers, schools, government organizations, and many others across the globe. The best about this server is that it is compatible with almost all common and leading email protocols: SMTP, POP3, or IMAP-based email service.

    The other plus point of this tool is that it easily integrates with all of your existing web main systems. It has the quality of being highly flexible and containing a score-based spam protection system that automatically scans the email before forwarding it to others. Three key benefits of using hMail Server are it is free and open-source, has a built-in anti-spam system, and has an advanced webmail system.

    hMail Server alternatives