Sendmail AlternativesMail Servers and other similar apps like Sendmail

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, Self-Hosted, Windows, BSD and Mac apps. The best Sendmail alternative is Postfix, which is both free and Open Source. Other great apps like Sendmail are Zimbra Collaboration Suite, Mail-in-a-box, Microsoft Exchange and Zentyal.

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

Sendmail

Mail Server
Free • Open Source

Sendmail is a 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.

More about Sendmail

Sendmail alternatives page was last updated Sep 9, 2022

Postfix
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.
26 Postfix alternatives
License model
- Free • Open Source
Application type
- Mail Server
Platforms
- Mac
- Linux
Postfix Features
Mail Filtering
Show all NaN Postfix features ▾
Postfix VS Sendmail
Is Postfix a good alternative to Sendmail?
- Almost everyone thinks Postfix is a great Sendmail alternative.
- Postfix is the most popular Mac & Linux alternative to Sendmail.
- Postfix is the most popular Open Source & free alternative to Sendmail.
- Postfix is Free and Open SourceSendmail is also Free and Open Source

Zimbra Collaboration Suite
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.
43 Zimbra Collaboration Suite alternatives
License model
- Freemium • Open Source
Application types
- Mail Server
- Calendar App
Platforms
- Linux
- Online
- Self-Hosted
Zimbra Collaboration Suite Features
Real time collaboration
ActiveSync
Active Directory integration
Show all NaN Zimbra Collaboration Suite features ▾
Zimbra Collaboration Suite VS Sendmail
Is this a good alternative to Sendmail?
- Zimbra Collaboration Suite is the most popular Web-based & Self-Hosted alternative to Sendmail.
- Zimbra Collaboration Suite is Freemium and Open SourceSendmail is Free and Open Source

Mail-in-a-box
Easy-to-deploy mail server.
15 Mail-in-a-box alternatives
License model
- Free • Open Source
Application type
- Mail Server
Platforms
- Self-Hosted
- Roundcube
Mail-in-a-box Features
IMAP Support
Nextcloud integration
Show all NaN Mail-in-a-box features ▾
Mail-in-a-box VS Sendmail
Is Mail-in-a-box a good alternative to Sendmail?

Microsoft Exchange
Exchange business-class email helps increase user productivity while protecting your data. Get it as a hosted service or run it on your servers.
44 Microsoft Exchange alternatives
License model
- Paid • Proprietary
Application type
- Mail Server
Platforms
- Windows
- Online
- Self-Hosted
- Microsoft Office 365
Microsoft Exchange Features
Real time collaboration
Show all NaN Microsoft Exchange features ▾
+1
Microsoft Exchange VS Sendmail
Is Microsoft Exchange a good alternative to Sendmail?
- Microsoft Exchange is the most popular Windows alternative to Sendmail.
- Microsoft Exchange is the most popular commercial alternative to Sendmail.
- Microsoft Exchange is Paid and ProprietarySendmail is Free and Open Source

Zentyal
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.
26 Zentyal alternatives
License model
- Paid • Open Source
Application types
- Mail Server
- Linux Distro
Platforms
- Linux
Zentyal Features
Gateway
Member Directory
Web interface
Show all NaN Zentyal features ▾
+1
Zentyal VS Sendmail
Is Zentyal a good alternative to Sendmail?

Exim
Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
17 Exim alternatives
License model
- Free • Open Source
Application type
- Mail Server
Platforms
- Mac
- Linux
Exim Features
SMTP Support
Show all NaN Exim features ▾
Exim VS Sendmail
Is Exim a good alternative to Sendmail?

CrossBox
Real-time email, chat, audio/video calls & conferences, file-sharing, and contacts app with a modern and intuitive UI.
39 CrossBox alternatives
License model
- Paid • Proprietary
Application types
- Mail Server
- WebMail Provider
Platforms
- Online
- Android
- iPhone
- Android Tablet
- iPad
- Self-Hosted
CrossBox Features
File Hosting
Show all NaN CrossBox features ▾
+9
CrossBox VS Sendmail
Is CrossBox a good alternative to Sendmail?
- CrossBox is the most popular Android, iPhone, iPad & Android Tablet alternative to Sendmail.
- CrossBox is Paid and ProprietarySendmail is Free and Open Source

OpenSMTPD
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.
12 OpenSMTPD alternatives
License model
- Free • Open Source
Platforms
- Linux
- BSD
- Self-Hosted
OpenSMTPD Features
SMTP Support
Show all NaN OpenSMTPD features ▾
OpenSMTPD VS Sendmail
Is OpenSMTPD a good alternative to Sendmail?

sSMTP
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.
19 sSMTP alternatives
License model
- Free • Open Source
Platforms
- Linux
sSMTP Features
Support for Node.js
SMTP Support
Show all NaN sSMTP features ▾
Discontinued
The last update was in 2013.
sSMTP VS Sendmail
Is sSMTP a good alternative to Sendmail?

Courier-MTA
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.
12 Courier-MTA alternatives
License model
- Free • Open Source
Application type
- Mail Server
Platforms
- Mac
- Linux
- BSD
- Self-Hosted
Courier-MTA Features
Mail Filtering
SMTP Support
IMAP Support
Show all NaN Courier-MTA features ▾
Courier-MTA VS Sendmail
Is Courier-MTA a good alternative to Sendmail?

Dragonfly Mail Agent
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.
7 Dragonfly Mail Agent alternatives
License model
- Free • Open Source
Platforms
- Linux
- BSD
Dragonfly Mail Agent Features
SMTP Support
Show all NaN Dragonfly Mail Agent features ▾
Dragonfly Mail Agent VS Sendmail
Is Dragonfly Mail Agent a good alternative to Sendmail?

Atmail Email Server
Atmail webmail system offers a webmail client, email server platform and mailserver appliance for Linux, Unix and Windows.
68 Atmail Email Server alternatives
License model
- Paid • Proprietary
Application types
- Email Client
- WebMail Provider
Platforms
- Linux
- Online
Atmail Email Server Features
Group Mail
Show all NaN Atmail Email Server features ▾
Atmail Email Server VS Sendmail
Is Atmail Email Server a good alternative to Sendmail?