Top 15 Linux Mail Servers That You Should Know and Use them 10

It is truthful to say that sending and receiving emails had been our first connections to others by way of the web. Emails are despatched and obtained by mail servers primarily based on a mix of many interconnected servers. In this text, prime 15 Linux mail servers might be launched that will help you know and use them. This content material can be helpful in case you have your personal enterprise since discovering a super mail server allow you to handle your every day emails and revel in different benefits of it.

Since Linux is light-weight and customizable, it’s a good selection for internet hosting mail servers. Regardless of the place your location is and what distro is your favourite, operaVPS presents you an ideal Linux VPS to host your personal mail server software program.

What is a Mail Server and How does it Work?

Computerized methods that may ship and obtain emails are known as mail servers. This system sometimes consists of quite a few linked servers that work collectively to transmit messages to the right individuals. Even although it simply takes a second to ship an e mail, a number of transfers from one mail server to a different are required.

Emails are moved from one Internet location to a different utilizing a Linux mail server program. They additionally go by the title Mail Transfer Agents (MTAs), and they’re liable for receiving incoming emails from different servers and passing them to the person’s consumer software program and again once more. Despite the truth that virtually all mail servers are able to dealing with each incoming and outgoing emails, the 2 duties are distinct and cling to completely different protocols. The Post Office Protocol 3 (POP3) or the Internet Message Access Protocol (IMAP) are sometimes utilized by an incoming mail server, and the Simple Mail Transfer Protocol (SMTP) is employed to ship emails which have already been obtained from the person’s consumer software program.

A small mail server will be all you want if your online business is small and solely has a number of customers. A extra highly effective server might be required in case you have a excessive variety of customers. stick with us to assessment the Top 15 Linux Mail servers to search out out which one meets your wants and covers your particular state of affairs. Before that, it’s essential understand how to decide on a super mail server for Linux.

Options Must be Checked whereas Choosing a Mail Server

There are a number of components to bear in mind when selecting a mail server. Let’s assessment an important options that you have to think about if you need to choose a mail server.

1. Security

When it involves administering mail servers, safety features are essential. To stop undesirable entry, many suppliers provide not only one however quite a few authentication options. A responsive alarm system to your mail server is one thing else you must take into consideration. In this way, if there’s a safety situation, you might be knowledgeable straight away. SMTP filtering, Real-time Black-Lists, and IP-based authentication are additional safety features.

2. Scalability

You should bear in mind the scalability component to deal with hundreds of customers when your agency is aiming to develop. You should pay attention to your organization’s product assist system and preserve monitor of the IO subsystem’s efficiency to be able to comprehend the scaling of mail servers. These may assist you to decide how a lot further {hardware} you have to to fulfill. To acquire a extra correct determine, you want moreover bear in mind the quantity of service consumption and logging.

3. Integration

If you make investments some huge cash in mail servers, you most likely need to mix them with different firm software program to make operations simpler. You should look at the design and inside workings of a mail server to find out whether or not it will probably coexist with different packages. It is feasible to inform whether or not a mail server has the required structure for efficiently integrating third-party software program by its pace and effectivity.

4. Functionality

The capacity of mail servers to ship, obtain, and supply entry to varied messages has considerably elevated through the previous ten years. The operation of those servers is at all times linked to elementary parts like POP, SMTP, and WebMail. To enhance the performance of your mail server, you too can add specific options.

5. Management of Antivirus and AntiSpam

Malware can leak personal communications to different servers, thus it’s essential to maintain it from moving into your mail server. Attachment management, computerized virus definition file downloads, and a number of other scan choices are a number of features to bear in mind for antivirus administration. You ought to search for obtain filters, sender checks, and mail experiences whereas managing anti-spam. You can use these instruments to help you in any emergency or situation.

6. Migration Support Services

It will value you some huge cash for those who ever have to switch information from one mail system to a different. Because of this, you ought to select a server with assist for MDIR or MBOX format migration. If the servers present entry interfaces, configuration information migration can also be doable.

Top 15 Linux Mail Servers

In this half, you may be conversant in the perfect mail servers for Linux and find out about their professionals and cons to have the ability to determine what fits your wants. Let’s get began.

1. Exim

Exim is regarded by many consultants as probably the greatest mail servers out there. It is a chunk of free software program that’s current within the majority of UNIX-like working methods. On Debian Linux methods, its fourth model serves because the MTA by default. Exim is a mail server with quite a few capabilities, every of which flawlessly completes a selected process. The most vital good thing about using Exim as your mail server is the pliability it presents when it comes to customization and configuration. It options the perfect switch brokers, which may simply customise to any company setting. The GNU GPL license permits directors to change the unique program as a result of this mail server runs on the Linux working system.

Overall, for those who require a Linux mail server, Exim is a stable possibility, particularly for those who want one thing that’s extraordinarily versatile.

Exim Advantages

  • Even for newbies, setting it up and managing it’s reasonably easy.
  • GNU GPL license0.
  • Exim can also be very efficient and adept at managing excessive mail volumes.
  • System-wide message filtering.
  • Exim is a extremely adaptable mail server that could be set as much as meet completely different necessities.
  • Encrypted SMTP connections utilizing SSL/TLS.
  • The exterior authenticator.

Exim Disadvantages

  • If you encounter difficulties, there may be much less group assist accessible.
  • Exim will be tough to configure for those who require options above the naked minimal.
  • The incontrovertible fact that it’s not as standard as another mail servers could possibly be a disadvantage.

2. Zimbra

Zimbra is without doubt one of the prime 15 Linux mail servers. This surpasses a Linux distribution when it comes to energy and effectiveness. Offering additional options like group calendars and sensible UI menus fosters a welcoming person expertise. This mail server’s restoration choices are spectacular since they transcend safety. An open-source, potent Linux mail server with many capabilities known as Zimbra Email Server. It is scalable, protected, and easy to make use of. It additionally helps a variety of {hardware} and working methods. It is due to this fact a incredible possibility for firms of all sizes. Additionally, Zimbra has a incredible person base that’s always ready to assist.

Zimbra presents customers a one-click catastrophe restoration instrument that will increase its dependability in pressing conditions or server breakdowns. It is a incredible alternative for those who’re looking for an e mail server that may accommodate your wants. It is well-known for its dependability and safety and has been utilized by hundreds of thousands of individuals worldwide.

Overall, organizations of all sizes ought to think about using Zimbra as their mail server. Although it has lots of options and suppleness, it might even be resource-intensive and difficult for learners to grasp.

Zimbra Mail Server

Zimbra Advantages

  • Free and open-source.
  • Zimbra has excessive scalability, so it will probably develop alongside your organization as your calls for alter.
  • Mobile net consumer utility.
  • Even for these with little expertise, it’s comparatively easy to arrange and administer.
  • Backup characteristic.
  • Zimbra is a really feature-rich mail server that provides a wide range of selections and instruments for controlling your e mail system.
  • Group calendars and doc sharing.

Zimbra Disadvantages

  • For new customers, the interface is usually a little daunting.
  • Zimbra might not be applicable for utilization on servers with decrease processing energy as a result of it may be reasonably resource-intensive.

3. Sendmail

Sendmail can also be one of many prime 15 Linux mail servers that may also be utilized in Windows NT. The first model of Sendmail, a general-purpose e mail routing system, was launched in 1983. Sendmail is a widely known MTA that provides a versatile choice of e mail supply strategies and is free. Sendmail can batch-send completely different addresses to a single host machine as a result of it doesn’t require lots of community capability. It makes use of configuration information to execute the directions in relation to customization. The incontrovertible fact that Sendmail makes use of protocols-compliant supply strategies has contributed to its recognition.

A Sendmail server makes an effort to ship emails to their supposed recipients as quickly as they’re obtained. It places messages in a queue to be despatched later if the recipient is absent. In actuality, it presents no mailbox companies. Therefore, further software program is required, comparable to POP3 and the Internet Message Access Protocol.

Sendmail mail server

Sendmail Advantages

Requires little community bandwidth.

It’s easy to configure and arrange.

Customized e mail forwarding capabilities.

It integrates successfully with different packages, comparable to spam filters.

An extraordinarily reliable and steady mail server is Sendmail. Many giant companies put it to use, and it has been round for some time.

Sendmail Disadvantages

  • The sendmail configuration may be tough for those who want to carry out greater than the naked minimal.
  • It doesn’t have as many frills like bells and whistles as a few of the newer mail servers.

4. Qmail

One of the perfect and hottest Linux mail servers is Qmail. It is a superb substitute for Sendmail. The SMTP protocol confirms this declare by supplying numerous credentials by way of the queue supervisor or the SMTP sender, and safety is the most important profit it presents shoppers. It is considered one of many prime 15 Linux mail servers resulting from its recognition and ease of use throughout settings. As a easy e mail supervisor, it’s straightforward to make use of Qmial and it’s steady sufficient to offer a protected atmosphere

qmail mail server

Qmail Advantages

  • Support for QMT.
  • Allows you to exchange any single a part of the system with another module.
  • VERPs, the EZMLM mailing checklist administration, and computerized host configuration are supplied.
  • Supporting a wide range of working methods, together with Linux, Solaris, Mac OS X, and BSD.
  • Managing personalized mailing lists and aiding with the automated detection and avoidance of mailing loops.
  • Wildcard mailboxes with person management.

Qmail Disadvantages 

  • It doesn’t permit web connections utilizing IPv6.
  • Many choices, comparable to these for outgoing SMTP messages, and so forth., have hard-coded increased limitations.
  • The account can’t be configured utilizing an everyday process. The general design is written to keep up a static interface.
  • The person might change into confused by the queue construction used to maintain the emails.
  • Although Qmail is open supply, it’s not free to make use of. Its distribution is noticeably slower, and sending prospects binaries is just not an possibility.

5. Citadel

Unquestionably among the many best mail servers for Linux is Citadel. This highly effective and extremely versatile e mail structure has stood the take a look at regardless of being launched 33 years in the past because of its distinctive efficiency and adaptable options. This mail server is a general-purpose groupware and collaboration suite that’s made to work with BSD UNIX distributions and open-source working methods like Linux. It shops all of its information within the Berkeley Database.

It is free and open-source software program that operates underneath the GNU General Public License. (GPLv2 and GPLv3). Most persons are conversant in this Linux mail server for its easy management interface and fast startup.

Citadel mail server

Citadel Advantages

  • OpenSSL encryption.
  • Easy to install and use.
  • Scheduler.
  • Built-in implementations of Internet Protocols.
  • Keeping information.
  • Multiple area assist.

Citadel Disadvantages

  • Clunky interface.
  • Complex configuration for novice customers.

6. hMailServer

Another free, open-source Linux mail server that’s well-liked throughout quite a few industries is hMailServer. SPF and SURBL are two of the built-in anti-spam applied sciences. It helps standard protocols like SMTP, POP3, and IMAPP. It can also be associated to a high-security characteristic that allows authentication and has a simple set up and setting course of. It can connect to your virus scanner to scan all incoming and outgoing emails and consists of customizable score-based spam safety.

hMailServer Mail Server

hMailServer Advantages

  • Free and open supply.
  • It’s fairly easy to arrange and configure. You should not have any hassle organising hMailServer, even for those who’ve by no means used a mail server earlier than.
  • Multi-domain helps.
  • Using plugins, you may additionally add extra performance.
  • hMailServer is extraordinarily reliable and steady.
  • SSL encryption.
  • Website administration.
  • If you want help configuring one thing or debugging an issue, you most likely can discover the answer within the guide.

hMailServer Disadvantages

  • Some of the extra subtle capabilities seen in different mail servers are absent from -hMailServer. It doesn’t present antivirus safety or spam filtering, as an illustration.
  • Not as many individuals use -hMailServer as a few of the different mail servers out there. As a outcome, there are fewer assets out there.
  • There is not any formal buyer help supplied as a result of hMailServer is open supply. If you encounter an issue, you’ll should depend on the group for assist.

7. Modoboa

One of the perfect open-source SQL-based Linux mail servers known as Modoboa. It offers quite a few important capabilities from a single person interface, eliminating the necessity to install every characteristic individually. Let’s Encrypt, a non-profit Certificate Authority offers a non-public and safe mailing possibility using the TLS protocol. Additionally, it frees you from reliance on e mail service suppliers.

Using DMARC, Modoboa is regularly used with the SPF and DKIM protocols. Through a reporting characteristic, these protocols, that are free e mail authentication strategies for e mail supply and safety, help senders and recipients in enhancing and monitoring the area’s protection in opposition to phishing emails. The good factor about it’s that it lets you arrange a fully-functional mail server by using probably the most essential options chances are you’ll profit from.

If you’re on the lookout for a protected and user-friendly mail server, Modoboa is a wonderful possibility. Anyone wishing to arrange a brand new mail server will discover it to be an acceptable various resulting from its easy interface and in depth safety features.

Modoboa mail server

Modoboa Advantages

  • Ease of use.
  • The net interface is easy and straightforward to make use of, which makes working your mail server a pleasure.
  • With the assistance of a wide range of plugins, Modoboa’s capabilities will be elevated as essential.
  • Calendars & Address books administration.
  • Uses SSL/TLS connections and encrypted passwords to guard your information.
  • Traffic monitoring.
  • presents quite a few further safety measures that may be set, together with spam filtering and two-factor authentication.

Modoboa Disadvantages 

  • Lack of documentation. If you could have difficulties, there’s not lots of documentation out there to help you.
  • Compared to different mail servers, it doesn’t presently have as many third-party integrations or plugins out there.

8. Postfix

Postfix is now supplied underneath the Eclipse Public License after being first made out there in 1998 underneath the IBM Public License 1.0. VMailer and IBM Secure Mailer are different names for Postfix. It is suitable with each UNIX-like working system that has a C compiler and POSIX improvement atmosphere, together with BSD, AIX, HP-UX, Linux, macOS, and Solaris. You can route and ship emails utilizing this sturdy open-source mail server. It serves as the usual message transmission agent for NetBSD, macOS, RedHat/CentOS, and Ubuntu.

For organising a mail server on a Linux system, Postfix is regularly used. It consists of a wide range of options and is easy to configure. An entire mail server answer will be made utilizing Postfix along side different purposes.

Postfix mail server

Postfix Advantages

  • Secure and Fast.
  • Easy to install and arrange.
  • Takes up little reminiscence.
  • Virtual area assist.
  • It has quite a few safety and anti-spam options.
  • Support for MYSQL, SQLite, PostgreSQL, LDAP, Memcached, CDB, and Berkeley Database.
  • Pre-packed content material filtering.
  • It has the power to function a relay.

Postfix Disadvantages

  • Beginners might discover the configuration file perplexing.
  • There is not any net interface.

9. Mail-in-a-Box

One of the highest 15 Linux mail servers is Mail-in-a-Box which is a simple-to-use Linux mail server that makes use of cutting-edge safety measures. In addition to computerized DNS configuration, spam filtering, greylisting, backups to Amazon S3, static web site internet hosting, and easy SSL certificates set up, it additionally presents you different important companies. With the assistance of this instrument, quite a few customers can obtain hosted mail, DNS, webmail, and an IMAP/SMTP server for desktop and cellular mail packages.

Mail-in-a-Box mail server

Mail-in-a-Box Advantages

  • Calendar and contacts synchronization.
  • Certificates totally free TLS (SSL) from Let’s Encrypt.
  • Putting into follow the newest safety procedures, comparable to opportunistic TLS, sturdy ciphers, and HST, in addition to modern mail protocols (SPF, DKIM, and DMARC).
  • Setting up and configuring e mail with a web-based management panel.

Mail-in-a-Box Disadvantages 

  • Complex setup processes.
  • The presence of bugs.
  • Software compatibility points.
  • Has an archaic person interface.

10. Cyrus IMAP Server

You can entry your personal emails utilizing the IMAP protocol with the assistance of the sturdy Linux mail server generally known as the Cyrus IMAP server. It additionally consists of companies for contacts and calendars. Your firm’s efficiency is enhanced by having quite a few companies linked to a mail server. Users can use IMAP, IMAPS, POP3, and POP3S to entry the mail server. A personal mailbox database that successfully optimizes the server for scalability and administration will be helpful to you.

The system software program on Cyrus mail servers has sturdy mail screening options. In order to take away pointless communications from customers’ accounts, the software program moreover employs Sieve filtering language. The e mail options are produced by the CalDAV and CardDAV protocols. The incontrovertible fact that this program continues to be being developed and can obtain common upgrades to appropriate faults and issues is essential to remember.

Cyrus IMAP Server Box mail server

Cyrus IMAP server Advantages

  • JMAP assist.
  • built-in with different purposes and methods.
  • Highly configurable.
  • Significant documentation and assist.
  • Supporting antivirus and anti-spam toolkits.

Cyrus IMAP server Disadvantages 

  • A little bit extra sophisticated to install and configure than another mail servers.
  • Because it’s not as standard as another mail servers, there won’t be as a lot group help.

11. Courier Mail Server

One of the few mail servers, Courier, presents distinctive protocols like ESMTP or IMAP to cater to sure wants and companies. Major working methods which are suitable with courier mail servers embody Linux, Mac OS X, and Solaris. Admin panel incorporates a far bigger choice of web-based administration and configuration instruments than the opposite selections on our checklist, making it way more snug to make use of. In order to chop down on spam emails, courier servers additionally embody a particular built-in filtering system.

Courier is usually a respectable possibility for you for those who’re looking for a simple mail server that’s easy to install and use. However, you may want to take a look at one of many different selections on our checklist for those who require extra options or flexibility.

Courier Mail Server Advantages

  • It presents an online interface that permits checking e mail from any laptop easy.
  • Courier is without doubt one of the most generally used mail servers for Linux. Due to its numerous options, Courier is a well-liked alternative amongst customers.
  • It could be very adjustable, permitting you to customise the way it features.
  • You can use it with nearly all of e mail purchasers as a result of it helps IMAP and POP3.

Courier Mail Server disadvantages

  • It could possibly be difficult to arrange. You might wrestle to arrange Courier for those who’re not skilled with server administration.
  • Compared to the opposite mail servers, Courier has fewer options.

12. SquirrelMail

One of probably the most well-known Linux mail servers is SquirrelMail, which is launched underneath the GNU General Public License. The IMAP and SMTP protocols are each supported by this free server, which was created in PHP. Its pages are displayed in HTML 4.0 and it’s easy to arrange and make the most of. It is extraordinarily reliable and able to dealing with huge volumes of mail. Spam filtering and safety measures like SSL encryption are additionally supported by SquirrelMail. It works properly with different packages like PhrasePress and could also be used with nearly all of standard net hosts.

Users who require a simple interface for studying and responding to emails ought to use SquirrelMail.


SquirrelMail mail server

SquirrelMail Advantages

  • Supports studying and sending HTML e mail messages.
  • Easy to make use of interface
  • IMAP protocol proxy server.
  • Have an deal with guide to retailer e mail addresses.
  • Capable to look and flag emails.
  • Spell checker.

SquirrelMail Disadvantages

  • Does not assist HTML composition.
  • Interface points due to updates lack.
  • Its upkeep and safety updates might be utterly the server administrator’s duty in cPanel model 78 and above.
  • SquirrelMail stopped offering safety upgrades in 2013. Squirrelmail is consequently dropped from cPanel in model 78.

13. Horde

An e mail server, duties and notes capabilities, contact administration, and different options are all included within the webmail and collaboration bundle generally known as The Horde Project. The program was created utilizing PHP and is distributed underneath the phrases of the GNU General Public License. This Linux mail server is easy to make use of, function, and scale up or down to fit your necessities. Any dimension group can use it, and its personnel is at all times out there to help you with any inquiries or points you might have.

Horde mail server

Horde Advantages

  • Has a mobile-friendly interface.
  • Supports IMAP, POP3, 3-pane, and 3-column layouts.
  • Supports News feed.
  • Offers easy-to-navigate dashboard.
  • Supports Calendar possibility.Users can create e mail filters and set preferences.
  • Spell-checker.
  • Supports cellular e mail entry.
  • Shared calendars, contacts, reminders, and IMAP information.

Horde Disadvantages

  • Wrong per-user settings within the Horde interface.
  • Partial database entries within the Horde database.
  • Login failed situation resulting from configuration errors.

14. Apache James

The different prime Linux mail server is the open-source Apache James which is a wonderful answer for people who require an e mail server that may handle quite a few emails as a result of it’s easy to arrange and configure. Additionally, it’s very best for firms that should adhere to stringent e mail requirements. The Apache James server can be utilized independently or as a element of a bigger system. It works with a wide range of mail purchasers and helps the SMTP and IMAP protocols.

It offers a feature-rich mail server with the power to construct personalized options by altering the elements. This mail server has linear scalability, thus modifications could also be made with out interfering with the middleware. The person has a variety of configuration choices, which makes it straightforward to interface with different applied sciences of the same caliber.

Apache James mail server

Apache James Advantages

  • Runs on nearly all of standard working methods (Windows, macOS, Linux),
  • Open supply software program.
  • Has an online interface for managing customers and messages.
  • Can simply be adjusted to function with numerous companies and apps and deal with excessive e mail site visitors volumes.

Apache James Disadvantages

  • Because it’s not as standard as another mail servers, there won’t be as a lot group help.
  • Might lack some functionalities that some customers require.

15. Axigen

One of the perfect mail servers that assist POP3, SMTP, IMAP, and webmail is Axigen, which is obtainable for Linux, Microsoft Windows, and Docker. It has groupware and collaboration options that could be used totally free, together with calendars, notes, duties, and outlook connections. This mail server’s improvement began in 2003 and is predicated on cutting-edge proprietary expertise. It accommodates all demanding prospects, together with each small and main service suppliers.

Offering an enormous array of preconfigured routines for specific processes, it elevates e mail administration to a brand new degree. Axigen additionally presents quite a few cellular options that improve its adaptability to completely different platforms and working methods.
Only 5 customers are permitted within the free model of Axigen, due to this fact if you wish to use all of the options, you must select knowledgeable plan. Axigen’s person interface is easy to grasp and use. Everything has a instrument, and it takes under consideration modern options like multi-layer entry management.

Axigen mail server

Axigen Advantages 

  • A handy deal with guide.
  • Offers a variety of capabilities.
  • Highly configurable platform.
  • It is easy to arrange and use.
  • Integrated Web-Admin and Web-Mail consumer.
  • Has complete documentation, and helps many domains.
  • Integrated mailing checklist server.

Axigen Disadvantages

  • It is much less standard than another mail servers, so for those who encounter points, there could also be fewer assets out there.
  • Lacking a webmail interface.

Check the professionals and cons of the mail servers on this article to search out out which one is the perfect for you. But, Modoboa and Citadel are complete.

Microsoft Outlook is just not a mail server. It is a mail consumer software program that’s used to speak with a mail server.


Top 15 Linux Mail Servers That You Should Know and Use them had been mentioned on this tutorial. 15 finest mail servers had been defined and that will help you detect which one needs to be your alternative, the professionals, and cons of them had been additionally talked about intimately. Depending on the distinctive necessities of your organization, you’ll be able to choose any one of many prime mail servers for Linux.

Keep in thoughts that the order of mail servers on this article has nothing to do with their superiority, it’s simply the creator’s association.

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