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  1. The Mercury Mail Transport System is a mail server that sends and receives messages on behalf of a group of users on a machine or local area network. Messages from the outside world are received by Mercury and delivered to the users, who can access it at any later point.

    Cost / License

    • Free Personal
    • Proprietary

    Application type

    Platforms

    • Windows
    21 alternatives
  2. Mail Server Builder empowers you to deploy a full-featured, unlimited self-hosted SMTP server effortlessly. Gain complete control over your email infrastructure, ensuring high deliverability and compliance without relying on third-party providers.

    Cost / License

    • Free
    • Proprietary

    Application type

    Platforms

    • Windows
    Mail Server Builder screenshot 1
    Mail Server Builder screenshot 1
    Mail Server Builder screenshot 2
    +6
    Mail Server Builder screenshot 3
    6 alternatives
  3. Centrify icon
     2 likes

    Unified Identity Services across data center, cloud and mobile — one single login for users and one unified identity infrastructure for IT.

    Cost / License

    • Paid
    • Proprietary

    Platforms

    • iPhone
    • iPad
    Centrify screenshot 1
    Centrify screenshot 1
    Centrify screenshot 2
    +3
    Centrify screenshot 3
    17 alternatives
  4. Ethereal is a fake SMTP service, mostly aimed at Nodemailer users (but not limited to). It's a completely free anti-transactional email service where messages never get delivered.

    Cost / License

    • Free
    • Proprietary

    Application type

    Platforms

    • Online
    Email preview screen
    Account created screen
    25 alternatives
  5.  2 likes

    Linux Schools consists of Karoshi Server and Karoshi client. It is an Ubuntu LTS Server based solution especially designed for educational environments. It is a fully modular and scalable distribuition, mainly written in Bash.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Linux
    Linux Schools screenshot 1
    4 alternatives
  6. Turnkey Solutions for the Enterprise Cloud

    Installation, Configuration, and Management tools for enterprise email, collaboration, messaging, video conferencing, file sharing, and file transfers.

    Cost / License

    • Paid
    • Proprietary

    Application type

    Platforms

    • Linux
    Expanding Communication screenshot 1
    34 alternatives
  7. iMail icon
     3 likes

    Fast, safe, heavy mail solution. Web-client access, LAN or WAN self-hosted server, maintenance-free design. No Windows server and database server required, unlimited mail accounts, storage, attachment size, custom logo. Free for commercial use.

    Cost / License

    • Paid
    • Proprietary

    Platforms

    • Windows
    • Self-Hosted
    iMail Server LAN Client.
    Sanwhole iMail Server
    46 alternatives
  8. Origami SMTP icon
     2 likes

    Origami SMTP was created with the idea to have a fake email server for testing purposes that supported TLS. This is because the code the developer was working on at the time had several hard coded values enforcing TLS so most other solutions would not work.

    Cost / License

    • Free
    • Open Source (MIT)

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • BSD
    Origami SMTP screenshot 1
    Origami SMTP screenshot 1
    23 alternatives
  9. NetEase Mail icon
     1 like

    NetEase Free Email - China's largest e-mail service provider, providing free e-mails suffixed with @163.com, @126.com, and @yeah.net. 16 years of experience in mailbox operation, the system is fast and stable, the spam intercept rate is over 98%, the mailbox capacity is...

    Cost / License

    • Free
    • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Online
    • Android
    • iPhone
    • iPad
    NetEase Mail screenshot 1
    NetEase Mail screenshot 1
    NetEase Mail screenshot 2
    +7
    NetEase Mail screenshot 3
    14 alternatives
  10. IDECO ICS icon
     1 like

    Linux based gateway for SMB with accent on security. With easy to use web-based configuration tool. With lots of additional features like mail server, VPN server, traffic shaping, DPI, traffic antivirus and etc.

    Cost / License

    • Freemium
    • Open Source

    Application types

    Platforms

    • Linux
    • Self-Hosted
    AD Integration
    Mail Server
    Intrusion Prevention
    +3
    IDECO ICS screenshot 3
    6 alternatives
  11. Greatmail icon
     1 like

    Affordable business email hosting starting at $1.95/mailbox with US-based phone support, spam filtering, and full IMAP/POP3/SMTP compatibility—ideal for small teams needing professional custom domain email without expensive productivity suite bundles.

    Cost / License

    • Paid
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Blackberry
    • Chrome OS
    • Android Tablet
    • iPad
    • Blackberry 10
    Email Hosting Guide
    Home Page
    MXMonitor Application
    +3
    Compose Message
    28 alternatives
  12. Archiveopteryx is an Internet mail server, optimised to support long-term archival storage. It seeks to make it practical not only to manage large archives, but to use the information therein on a daily basis instead of relegating it to offline storage.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Linux
    • BSD
    8 alternatives
  13. Proofpoint icon
     1 like

    Proofpoint, Inc. (NASDAQ: PFPT) helps the largest and most successful companies in the world protect and govern their most sensitive data.

    Cost / License

    • Paid
    • Proprietary

    Platforms

    • iPhone
    4 alternatives
  14. Apache James icon
     1 like

    James stands for Java Apache Mail Enterprise Server! It has a modular architecture based on a rich set of modern and efficient components which provides at the end complete, stable, secure and extendable Mail Servers running on the JVM.

    Cost / License

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Self-Hosted
    7 alternatives
  15. Sendria icon
     3 likes

    Sendria (formerly MailTrap) is a SMTP server designed to run in your dev/test environment, that is designed to catch any email you or your application is sending, and display it in a web interface instead of sending to real world.

    Cost / License

    • Free
    • Open Source (MIT)

    Application type

    Platforms

    • Mac
    • Linux
    • Self-Hosted
    • Docker
    Sendria screenshot 1
    11 alternatives
  16. Sanwhole Exchange is a server running iMail, iPress and iStore services. iMail is an enterprise-class email server does Microsoft Exchange and Gmail work. iPress sets blog, forums and tickets in one. iStore is an online store.

    Cost / License

    • Paid
    • Proprietary

    Application type

    Platforms

    • Windows
    iMail
    iPress
    iStore
    45 alternatives
  17. Xeams icon
     1 like

    Xeams is a secure and powerful mail server for that includes a powerful spam filtering engine that eliminates up to 99% of junk email right out of the box. The software offers a flexible approach to email, making it a very user friendly server.

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • BSD
    16 alternatives
  18. Mr. Mail icon
     1 like

    MrMail offers flexible Zimbra Hosting packages suitable for everyone, from single home user to a large company (SME) at superb prices and the best support in the industry.

    Cost / License

    • Paid
    • Proprietary

    Platforms

    • Online
    42 alternatives
  19. Magma icon
     1 like

    Magma is a fully-featured, commercial-grade email server with support for SMTP, POP3, IMAP, HTTP, and an internal protocol MOLTEN. Support for the DIME ecosystem of advanced encryption protocols is currently in active development. Originally created by Ladar Levison for lavabit.

    Cost / License

    Application type

    Platforms

    • Linux
    • Self-Hosted
    7 alternatives
  20. Halon icon
     1 like

    Halon is a global leader in email infrastructure, empowering large senders and mailbox providers to maximize email. Founded in 2010, Halon's solutions process billions of emails daily worldwide.

    Cost / License

    • Paid
    • Proprietary

    Application type

    Platforms

    • Linux
    • BSD
    • Self-Hosted
    • Amazon Web Services
    • Microsoft Azure
    • Google Cloud Platform
    • Docker
    • Kubernetes
    Halon screenshot 1
    Halon screenshot 1
    Halon screenshot 2
    6 alternatives
  21. WildDuck icon
     1 like

    WildDuck is a scalable no-SPOF IMAP/POP3 mail server. WildDuck uses a distributed database (sharded + replicated MongoDB) as a backend for storing all data, including emails.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Self-Hosted
    WildDuck screenshot 1
    8 alternatives