Best mail server linux

10 Best Mail Servers for Linux OS

Updated on January 18, 2021

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

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

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 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

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:

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Лучшие почтовые серверы Linux

Электронная почта — это не просто веб-сайт, на котором вы можете обмениваться сообщениями, такой как ВКонтакте или Facebook. Это более сложный механизм, который работает с помощью собственного протокола. В сети почтовые клиенты отправляют письма на почтовый сервер, затем они уже направляются к адресату.

Именно потому мы можем отправлять почту всем адресатам, независимо от их домена, mail, gmail, yandex и т д. На низком уровне эти сервисы работают по одному протоколу. Чтобы отправить сообщение почтовый сервер использует программу MTA (Mail Transfer Agent). В этой статье мы собрали лучшие почтовые серверы для Linux.

Лучшие почтовые серверы для Linux

MTA — это приложение, которое определяет маршруты и передает электронную почту от одного узла в сети к другому. Для этого используется протокол SMTP — Simple Mail Transfer Protocol или простой протокол передачи почты. Для отправки почты используется почтовый клиент, он может отправлять и получать письма от почтового сервера и тоже использует SMTP, но это необязательно MTA. MTA работают на сервере, а на компьютерах используются почтовые клиенты, такие как Mozilla Thunderbird, Evolution, Outlook и т д.

1. Sendmail

Почтовый сервер Sendmail теперь известный как Proofpoint, после того как Proofpoint Inc. приобрела Sendmail Inc. На сегодняшний день — это самый популярный и самый старый MTA для операционной системы Linux. Если сравнивать Sendmail и более современные почтовые серверы, то здесь есть много ограничений.

Настройка сервера очень сложная, а система безопасности слабая, поэтому были разработаны альтернативные почтовые серверы. Но все же он достаточно хорошо справляется со своей задачей. Продолжим наш обзор почтовых серверов linux более современными вариантами. Этот почтовый сервер очень часто использовался в связке с интерпретатором языка программирования PHP для отправки почты.

2. Postfix

Postfix — это ещё один популярный почтовый сервер с открытым исходным кодом, который был разработан компанией Wietse Zweitze Venema для собственного почтового сервера, когда он работал в научно-исследовательском отделе IBM. Он составляет сильную конкуренцию для очень популярного Sendmail и может работать на всех Unix подобных системах.

Здесь позаимствовано много свойств Sendmail, но есть и множество отличий и улучшений. Postfix быстрый, безопасный и легкий в настройке. Согласно статистике более 30% всех почтовых серверов на данный момент используют Postfix.

3. Exim

Свободный почтовый сервер для операционных систем на базе ядра Linux, а также BSD. Он написан на Си и очень производительный, поэтому может использоваться для отправки огромного количества писем. К тому же сейчас он активно развивается, прост в настройке и поддерживает большое количество баз данных.

4. Qmail

Qmail — еще один свободный и современный сервер отправки электронной почты с открытым исходным кодом. Он простой, надежный и эффективный, предлагает широкие возможности безопасности. Разрабатывался Qmail как альтернатива для Sendmail и написан он на Си. Поэтому показывает неплохую производительность. Из преимуществ в нём встроены дополнительные механизмы управления списками рассылки, а также фильтрации спама.

5. Dwarf Mail Server

Уже довольно старый, но всё равно функциональный почтовый сервер, написанный на Java. Он поддерживает протоколы работы почты SMTP, POP3 и IMAP4. Подходит как для обычных пользователей, которым нужен простой почтовый сервер, так и для разработчиков. Работает на всех платформах, поддерживающих Java и не требует тратить много времени на настройку.

6. MailerQ

Это современный и высокопроизводительный почтовый сервер позволяющий отправлять и переправлять очень большое количество почты. Но у него есть один значительный недостаток. Он платный. Версия для установки на один сервер стоит 10 тысяч евро на данный момент. Зато он поддерживает мониторинг в реальном времени, позволяет показывать детальную статистику о попытках отправки почты, очередях, и логах ошибок.

7. Courier Mail Server

Этот почтовый сервер распространяется под лицензией GPL и поэтому он полностью бесплатен для использования. Он известен своей модульностью, его компоненты для работы с IMAP, или система фильтрации почты Maildrop могут быть установлены и использованы отдельно от всего остального. Сам почтовый сервер написан на C++ и Perl и может работать в Linux, MacOS и FreeBSD. Поддерживаются такие протоколы как ESMTP, IMAP, POP3 и SMAP.

8. Apache James Server

Это ещё один почтовый сервер, написанный на Java и развиваемый организацией Apache Software Foundation. Он поддерживает протоколы SMTP, LMTP, POP3, IMAP, JMAP а также ManageSieve. Проект понемногу развивается и сейчас он предназначен для работы на Java машине 11 версии. Сервер можно использовать в качестве SMTP релея или для доставки почты по локальным ящикам, причём поддерживаются как локальные учётные записи, так и виртуальные почтовые ящики.

Выводы

В этой статье мы рассмотрели как передается электронная почта по сети, а также лучшие почтовые серверы Linux. Для обработки почты на Losst используется Postfix. А какой почтовый сервер используете вы? Какой считаете лучшим? Почему? Напишите в комментариях!

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Best Mail Servers for Linux

Before an email can reach its destination (e.g. your Gmail inbox), it must pass through a number of checkpoints first. These are referred to as mail servers, and the program that enables you to send or receive emails is known as an email client. We can think of a mail server as being a postal worker, the type you see delivering mail day in, day out. They may have to travel some distance and achieve multiple goals before they bring you mail each morning. To explore multiple mail servers, it’s vital that we recognize the way in which they communicate and the protocols set up to ensure each message is authenticated. Below, we’ll explore some essential details on mail servers for Linux to help you find the right one for your company.

What Are Mail Servers?

Mail servers are computerized systems designed to send and receive messages. Systems typically comprise a number of interconnected servers, all helping each other to send an email to the proper recipient.

It’s easy to take this for granted when dashing messages off throughout the day. Yes, actually hitting the send button may only take a second, but the email must undergo several transfers from one mail server to the next (and so on).

Without the mail servers outside your domain reach, you could only send messages to users with email addresses that match your domain.

What Are Email Clients?

Email clients are fairly different from mail servers: they help emails to pass from one server to another until they reach the intended recipient. Unlike the servers, email clients don’t handle storage facilities, and they need to have a connection to the shared network.

Microsoft Outlook and Mozilla Thunderbird are two of the most popular email clients. They (and others) offer an interface through which you can keep your messages organized and easy to find with categorization. You can add or view attachments using email clients too.

The Fundamentals

Emails have been available for decades, though it hasn’t always been as convenient and reliable as it is today. Going back 20 years or so, messages were sent via a single mainframe system, but now we have unique protocols empowering us to create interconnections between a huge number of mail servers.

Building a shared network consisting of many mail servers, we have harnessed the internet to enable communication between servers. This channel isn’t a one-step operation: instead, it passes through a sequence of servers to arrive in the designated inbox. It can be a complex process.

That’s why we’ve created a streamlined message flow, tracking an email’s journey from composition to delivery:

Step 1:

The email is written with an email client, sent from Gmail or Apple Mail. Once you finish composing your message and press the send button, the email client connects to your domain’s server automatically.

Step 2:

This server interacts with the client to gather key details (e.g. the email address for the recipient, the message’s body, and attachments that may be included. This assists the server in locating the destination.

Step 3:

The server follows a standard protocol known as Simple Mail Transfer Protocol (SMTP) to start the transfer. This involves the server running a search for the recipient’s domain name and finding the final server near to the target destination. A DNS server is used to get the recipient’s domain name, and it connects with the destination mail server (known as the Mail Exchanger, or MX).

Step 4:

Next, the mail transfer agent (MTA) finds and delivers the message to its final destination. The recipient accepts it via two main protocols:

• Post Office Protocol (POP)
• Internet Message Access Protocol (IMAP)

Both SMTP servers play a crucial part in the delivery and reception of emails, as they perform scans at both ends for authenticating usernames and domain names. The protocols differ for every organization, and you’ll have to align your needs with an emailing process.

What Are the Benefits of Mail Servers?

You may ask why it’s so beneficial to install mail servers. And that’s fair enough when we consider that the expense of the necessary hardware and energy required can be on the steep side. That’s definitely the case for smaller businesses managing hundreds of mail accounts.

But mail servers deliver remarkable value for money in the long run. Let’s look at some of the major benefits:

• You’ll receive emails instantly with no delay. All external emails will come to you directly after you install a mail server with your domain name — with NO waiting time. Without a mail server, the sending machine will probably utilize a back-off algorithm that causes messages to jump from server to server. This leads to a longer delay, and this will be worse if you have a weak internet connection.
• Internal emails are delivered to the destination immediately after the sender taps the send button. Everyone will probably have the same domain name inside a business, so utilizing a mail server can lead to much faster message processing. Plus, leveraging mail servers for internal communications doesn’t depend on the size of attachments and internet access.
• Mail servers provide you with full control over the users, allowing you to add or delete names whenever you like. With Internet Service Providers, this isn’t the case: they limit the number of users you can set up at your end.
• Mail servers can implement virus scanning and spam filtering on a level that ISPs simply can’t compete with. The issue with an ISP is that they have total control over scanning and authentication processes — but you’ll take charge when you install a mail server.
• You can execute special emails for faxes and printers with a mail server. You may print copies or send faxes of documents automatically, for additional communication options.

Questions to Ask Before Choosing Your Mail Server

What is its functionality like?

Within the past 10 years or so, we’ve seen a sharp increase in mail server functionality. They’ve evolved from sending, receiving, and offering access to messages. Mail servers’ functionality is associated with such essential protocols as SMTP, POP, IMAP. You can also incorporate certain functionalities to help your mail server unleash its full potential.

Is it scalable enough?

You need to think about scalability when growing your business, to ensure you can support the communication requirements of many more users. A core component of scaling mail servers is understanding your organization’s product support system and monitoring the performance of the IO subsystem. These can provide you with a good idea of the hardware you’ll need to meet requirements. If you want a more accurate number, you’ll have to explore the logging and service usage level.

Can it be integrated with other software?

Let’s say you pay a lot of money for your mail servers. You’ll probably want to integrate them with other software to make your operations more efficient. You need to analyze the architecture of the mail server and its function to understand if a mail server can work with specific software. You can use efficiency and speed to determine whether or not a mail server’s architecture will allow it to integrate with other software properly.

What migration facilities does it offer?

If you need to transfer data from one mail system to another, that comes with a cost. That’s why it’s best to pick a server with migration facilities, with a MDIR or MBOX format. You can migrate configuration data, too, if the servers feature access interfaces.

What security is available?

One of the most important factors when managing your mail servers is security. A lot of providers include multiple authentication features to prevent unauthorized users gaining access. You should think about implementing a responsive alert system for your mail server, so you’ll receive an immediate notification if a security problem emerges. Other security features that may prove beneficial are SMTP filtering, RealTime Blacklists, and IP-based authentication.

What antivirus and antispam protection is available?

You must stop malware from infecting your mail server to prevent it leaking private emails to other servers. Consider trying attachment control, multi-scan options, and auto downloading of virus definition files for effective antivirus management. With regards to antispam, try sender checking, mail reports, and download filters, all of which can help defend your business.

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