Sendmail Alternatives

Sendmail is described as 'general purpose internetwork email routing facility that supports many kinds of transfer and delivery methods, including the Simple Mail Transfer Protocol (SMTP) used for email transport over the Internet' and is a Mail Server in the online services category. There are more than 25 alternatives to Sendmail for a variety of platforms, including Linux, Windows, Self-Hosted, Mac and Web-based apps. The best Sendmail alternative is Zimbra Collaboration Suite, which is both free and Open Source. Other great apps like Sendmail are Zentyal, Mail-in-a-box, Postfix and Microsoft Exchange Server.

Sendmail alternatives are mainly Mail Servers but may also be WebMail Providers or Email Clients. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Sendmail.

Sendmail alternatives page was last updated

Sendmail

Free • Open Source
Mail Server

Sendmail is a general purpose internetwork email routing facility that supports many kinds of transfer and delivery...

More about Sendmail

Zimbra Collaboration Suite
Is this is a good alternative?
Yes
No
Freemium • Open Source
Mail Server
Calendar App
Team Collaboration Tool
Linux
Online
Self-Hosted
41 Zimbra Collaboration Suite alternatives
Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra boosts the productivity of users on any desktop and dramatically reduces TCO compared to legacy platform vendors.
- - Zimbra Collaboration Suite is the most popular Web-based, Linux & Self-Hosted alternative to Sendmail.
- - Zimbra Collaboration Suite is the most popular Open Source & free alternative to Sendmail.
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Zimbra Collaboration Suite Features
1. Real time collaborationMultiple users can work together in Zimbra Collaboration Suite simultaneously.
ActiveSync
Active Directory integration
Zentyal
Is this is a good alternative?
Yes
No
Paid • Open Source
Mail Server
Linux Distro
Linux
27 Zentyal alternatives
Zentyal is a native Microsoft Active Directory implementation on Linux incorporating all the network services required in a small and medium business environment: Directory & Domain Server, Mail Server, Gateway and Infrastructure Server.
- - Zentyal is the most popular commercial alternative to Sendmail.
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Zentyal Features
Gateway
Member Directory
Web interface
Mail-in-a-box
Is this is a good alternative?
Yes
No
Free • Open Source
Mail Server
Self-Hosted
Roundcube
13 Mail-in-a-box alternatives
Easy-to-deploy mail server.
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Mail-in-a-box Features
IMAP Support
Nextcloud integration
Postfix
Is this is a good alternative?
Yes
No
Free • Open Source
Mail Server
Mac
Linux
24 Postfix alternatives
Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail. It attempts to be fast, easy to administer, and secure. The software is also known by its former names VMailer and IBM Secure Mailer.
- - Postfix is the most popular Mac alternative to Sendmail.
Postfix has no features, suggest some!

Opinions about Postfix as a Alternative to Sendmail
Almost everyone thinks Postfix is a great Sendmail alternative.
Microsoft Exchange Server
Is this is a good alternative?
Yes
No
Paid • Proprietary
Mail Server
Windows
Online
44 Microsoft Exchange Server alternatives
Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft. It is part of the Microsoft Servers line of server products and is widely used by enterprises using Microsoft infrastructure solutions.
- - Microsoft Exchange Server is the most popular Windows alternative to Sendmail.
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Microsoft Exchange Server Features
1. Real time collaborationMultiple users can work together in Microsoft Exchange Server simultaneously.
OpenSMTPD
Is this is a good alternative?
Yes
No
Free • Open Source
Linux
BSD
Self-Hosted
12 OpenSMTPD alternatives
OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with some additional standard extensions. It allows ordinary machines to exchange e-mails with other systems speaking the SMTP protocol.
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OpenSMTPD Features
SMTP Support
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Exim
Is this is a good alternative?
Yes
No
Free • Open Source
Mail Server
Mac
Linux
16 Exim alternatives
Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
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Exim Features
SMTP Support
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sSMTP
Is this is a good alternative?
Yes
No
Free • Open Source
Linux
19 sSMTP alternatives
sSMTP is a simple MTA to deliver mail from a computer to a mail server. sSMTP is simple and lightweight, there are no daemons or anything hogging up CPU; Just sSMTP. Unlike Exim4, sSMTP does not receive mail, expand aliases, or manage a queue.
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sSMTP Features
Support for NodeJS
SMTP Support
Discontinued
The last update was in 2013.
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msmtp
Is this is a good alternative?
Yes
No
Free • Open Source
Linux
Xfce
7 msmtp alternatives
In the default mode, it transmits a mail to an SMTP server (for example at a free mail provider) which takes care of further delivery.
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msmtp Features
Network Tools
SMTP Support
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Courier-MTA
Is this is a good alternative?
Yes
No
Free • Open Source
Mail Server
Mac
Linux
BSD
Self-Hosted
11 Courier-MTA alternatives
The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols, such as ESMTP, IMAP, POP3, LDAP, SSL, and HTTP. Courier provides ESMTP, IMAP, POP3, webmail, and mailing list services within a single, consistent, framework.
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Courier-MTA Features
1. Mail FilteringCourier-MTA classifies email messages according to specified criteria, allowing you to automatically recognize fraudulent or spam messages.
SMTP Support
IMAP Support
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Atmail Email Server
Is this is a good alternative?
Yes
No
Paid • Proprietary
WebMail Provider
Email Client
Mail Server
Linux
Online
67 Atmail Email Server alternatives
Atmail webmail system offers a webmail client, email server platform and mailserver appliance for Linux, Unix and Windows.
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Atmail Email Server Features
Group Mail
Dragonfly Mail Agent
Is this is a good alternative?
Yes
No
Free • Open Source
Linux
BSD
7 Dragonfly Mail Agent alternatives
A small Mail Transport Agent (MTA), designed for home and office use. Part of DragonFly BSD , it accepts mails from locally installed Mail User Agents (MUA) and delivers the mails either locally or to a remote destination.
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Dragonfly Mail Agent Features
SMTP Support
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