10 Best Mail Servers for Linux OS


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Best Mail Servers for Linux OS

Nowadays, using the best mail servers is one of the key methods to increase the business’s revenue in the long term. Best mail servers are an easy and smart source to achieve the best marketing results and open a new way to develop customer acquisition and retention for any sized business.

When the importance of emails is that clear, it is far too difficult to launch a business without taking advantage of the best mail servers. To manage your backlog of emails daily, you need the best Linux email server to take the first step more effectively. This article will help you select the best Linux mail server, now dive in to learn more about10 the best mail servers for Linux OS.

What are the best mail Servers for Linux?

1- Sendmail


One of the best mail servers for Linux that can also be used in Windows NT is Sendmail. As Mailserver.com is mentioned, this is the No.1 MTA in use today. A general-purpose internet network email routing facility that its first version was released in 1983.

It is an MTA that is well known for being free (it also has spread as a proprietary software), open-source, and based on UNIX. One of the oldest and most used mail transfer agents provides a versatile set of delivery methods for sending emails.

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When a Sendmail server receives an e-mail, it attempts to immediately deliver that to the intended recipient. If the recipient is not present, it queues messages to deliver them later. In fact, it doesn’t provide any mailbox facility. So, other software such as Internet Message Access Protocol and POP3 are needed. Some of the best features of this Linux mail server software are:

  1. Reliable in message delivery.
  2. Need very little network bandwidth.
  3. Customized email forwarding facilities.
  4. Using configuration files to control mail configuration.

2- Exim

exim mail server

This is a UNIX-like mail transfer agent developed at the University of Cambridge. Distributing under the GNU General Public License, it aims to be one of the most flexible mailers with a great number of facilities for checking incoming e-mails. Exim is free software that has been ported to most UNIX-like systems in which the fourth version is the default MTA on Debian GNU/Linux systems. Some of the best features of this mail server are:

  1. The external authenticator.
  2. Pre-built support for a large number of database management systems such as MYSQL, Oracle DB, SQLite, PostgreSQL, and Redis.
  3. Encrypted SMTP connections using SSL/TLS.
  4. Straightforward configuration, customization, and task management.
  5. Three log mechanisms are named main log, panic log, and reject log.
  6. Local scan function.
  7. System-wide message filtering.
  8. Message processing.
  9. GNU GPL license

3- Postfix

postfix mail server

It was released under the IBM Public License 1.0 that is a free software license. It was first released in 1998, and now, is available under the Eclipse Public License. Postfix is also known as IBM Secure Mailer and VMailer. It runs on BSD, AIX, HP-UX, Linux, macOS, Solaris, and every UNIX-like operating system with a C compiler and POSIX development environment. This powerful, and open-source mail server can be used for routing and delivering e-mails. It is the default message transfer agent for Ubuntu, RedHat /CentOS, NetBSD, and macOS. Some of the most important features of this Linux mail server are listed below:

  1. Junk mail control.
  2. Database support.
  3. Fast and secure.
  4. Flexibility in administration.
  5. Convenient log management.
  6. Defense against spambots.
  7. Pre-packed content filtering.
  8. Virtual domain support.
  9. Configurable status notification.
  10. Support for many standard databases including MYSQL, SQLite, PostgreSQL, LDAP, Memcached, CDB, and Berkeley Database.

This mail server consists of a large number of programs that run in the background and a few programs that interact with the user processes. You can imagine the whole system as a router because it looks at the IP packet, and determines the destination and resource IP address exactly like a router. Then, it selects the right interface to route the mail toward its destination.

4- Axigen

axigen mail server

Axigen is one of the best mail servers for Linux, Microsoft Windows, and Docker that supports POP3, SMTP, IMAP, and webmail. It comes with groupware and collaboration functionalities (like calendars, notes, tasks, and outlook connectors) that can be completely free. The development of this mail server began in 2003 based on innovative proprietary technology. It supports all demanding users from small businesses to large service providers. Some of the good features of this mail server are:

  1. Integrated mailing list server.
  2. Fully Automatic Migration Tool (without the need of the legacy accounts passwords).
  3. Antivirus and Antispam integration options.
  4. Malware and Spam Protection Mechanism.
  5. Providing a convenient address book.
  6. Unmatched manageability for administrators.
  7. Various mobile capabilities including mobile-friendly webmail and Exchange Active Sync support.
  8. Can be hosted in data centers, on bare-metal, private or public cloud servers.
  9. Multiple, customizable advertising and branding options.
  10. Integrated Web-Admin and Web-Mail client.
  11. 60-day, Full-Featured Trial.
  12. Highly configurable platform.

5- Citadel

citadel mail server

With no doubt, this is one of the best mail servers for Linux and UNIX. Despite the initial release back 33 years ago, it passes the test of time because of its superior performance and flexible features. This mail server is a general-purpose groupware and collaboration suite that is designed to run on open-source operating systems such as Linux, and BSD UNIX distributions (but supports most systems). It uses the Berkeley Database for all of its data stores.

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It is open-source and free software that works under the license of GNU General Public License (GPLv2 and GPLv3). This Linux server is mostly known for its simple control panel and efficient runtime.  Moreover, it has a lot of good features that some of which are listed below:

  1. Shared calendar.
  2. Instant messaging.
  3. A convenient address book.
  4. Scheduler
  5. File storage.
  6. Jabber alongside SSL/TLS encryption
  7. OpenSSL encryption.
  8. Built-in implementations of Internet Protocols such as POP3, IMAP, SMTP, and XMPP.
  9. Web-based user interface base on Ajax style functionality for application-like interactions.
  10. OpenDAP and Microsoft Active Directory support.

6- Modoboa


Modoboa is one of the best Linux open-source SQL-based mail servers, which accesses a set of useful functionalities from one interface that does not require installing each capability individually. It offers a secure and private mailing method using the TLS protocol Let’s Encrypt, a nonprofit Certificate Authority, and makes you free of email providers’ dependency.

Modoboa is widely deployed with SPF, DKIM protocols using DMARC. These protocols are free to email authentication technologies for email delivery and email security that, through a reporting function, help senders and receivers to boost and monitor the protection of the domain from fraudulent email. The nice thing is that it lets you configure a fully-functional mail server through the most important features you can benefit from:

 Best control panels for Linux (2021)
  • Includes webmail
  • Has calendars management
  • Includes address books management
  • Create visualized filtering rules to organize emails
  • auto-responder
  • Supports numerous creation of domains, mailboxes, and aliases
  • Offers administrator tools that help you monitor the traffic

7- Qmail


Qmail is among the best Linux mail server, which is known as a mail transfer agent. It is one of the most widely-used mail servers, which is an excellent replacement for Sendmail. It offers different kinds of benefits for users that security is the biggest one; the SMTP protocol verifies this blame by providing different credentials through the queue manager or the SMTP sender. Also, its simple and easy configuration makes it popular as the best Linux mail server.

Some valuable features are listed below:

  • Has QMT support
  • Supports different platforms such as Linux, Solaris, Mac OSX, and BSD.
  • Offers ezmlm mailing list manager, VERPs, and automatic host configuration.
  • Has a modular-based system (Allows to replace any single part of the system with an alternative module)
  • Manage custom mailing lists and supports the automatic prevention of mailing loops
  • Includes user-controlled wildcard mailboxes

8- hmailserver

hmail server

hmailserver is another free, open-source best Linux mail server that is popular among a variety of industries. It comes with built-in antispam technology, including SPF and SURBL, and consists of main protocols such as IMAPP, SMTP, and POP3. Moreover, it has simple installation and configuration and is associated with a high-security ability that enables authentication.

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hmailserver Features

  • Includes SSL encryption
  • Has westie administration
  • Uses built-in backup
  • Scan all incoming and outgoing emails
  • Multi-domain supports
  • Offers custom SMTP routes for particular domains

9- Cyrus IMAP server

cyrus imap

The Cyrus IMAP server is a powerful Linux mail server that helps you access your private mails via IMAP protocol. It also covers contact and calendar services, so having multiple services attached to a mail server improves your business performance.

Users can access the mail server through IMAP, IMAPS, POP3, POP3S, or KPOP. You can benefit from a private mailbox database that optimizes the server efficiently, with scalability and administration.

Here are Crus IMAP server Features:

  • Has JMAP support
  • Supports antivirus and antispam toolkits
  • Handles deliverability: SPF, DKIM, DMARC
  • Uses mail filtering
  • Fully authentication options through Cyrus SASL
  • Deploys consistent software updates
  • Supports access control lists on mailboxes

10- Mail-in-a-Box

mail in a box

Mail-in-a-Box is an easy-to-use Linux mail server provider which uses the latest security solutions. It provides you with useful services: automatic DNS configuration, spam filtering, greylisting, backups to Amazon S3, static website hosting, and easy SSL certificate installation.

This tool aids in providing a hosted mail for multiple users and DNS and delivers the webmail and an IMAP/SMTP server for mobile and desktop mail software.

Mail-in-Box Features

  • Uses web-based control panel for email configurations and settings
  • Includes contacts and calendar synchronization
  • Includes free TLS (SSL) certificates from Let’s encrypt
  • Implements modern mail protocols (SPF, DKIM, and DMARC) and the latest security best practices, including opportunistic TLS, strong ciphers, and HST

Choose the Best Linux VPS to host your mail server

After choosing the most appropriate Linux mail server, now you need a Linux VPS hosting to run your mail servers based on your customization needs and get higher performance. Linux VPS is an all-in-one-package tool that lets you use it for any location best fits your business.

In addition, it provides you with robust infrastructure and ultra-fast connections to experience a secure and safe space at a cost-effective price. So, having access to ultra-fast SSD storage with NVMe protocol plus faster processing and less resource contention evolves your business performance.

Routerhosting Linux VPS solutions are also an almost cheap option for new small businesses to make the best of their websites and servers. Start small and gradually scale up when your business grows.

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That was it for the ten best mail servers for Linux Os to consider the features and uses for your business. Knowing them should undoubtedly help you find a clear mind map of your organization’s requirements for establishing a good Linux mail server that suits your approach.

Thus, there is no fixed recommendation to choose the best-suited Linux mail server for your business. In that case, you would experience running a free mail server on your Linux VPS to ease the bunch of complex technical backlog.


What is a Linux Mail Server?

A Linux Mail Transport Agent (MTA) or a Mail Server is software used for transferring mail from one Linux user to another one. Some of the best mail servers for Linux operating systems are Sendmail, Exim, Postfix, Axigen, and Citadel.

Which Mail server is the Best in Linux OS?

There are a variety of mail servers running in the Linux Operating System and its distributions. You can choose one of them based on our provided list.

What is an example of a Mail Server?

An email server or a mail server is a computer system that sends and receives emails. For instance, POP3 and IMAP protocols receive messages or SMTP protocol, sends messages, and handles outgoing mail requests.

Mary is a creative author who believes content is all about fulfilling users' needs and concerns. She always tries to provide the best solutions for her audience.


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2 thoughts on “10 Best Mail Servers for Linux OS”

  1. Thanks for this great article I introduced one of these mail servers to one of my friends and he is quite satisfied

  2. What is the difference between mail server for windows and Linux? Because I saw that you have an article for windows mail servers too and I want to know do they work differently or what?

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