Alternatives to sSMTP for all platforms with any license

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...

Free Open Source Mac Linux
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22 Like
Exim

Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.

Free Open Source Mac Windows Linux
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12 Like
msmtp

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. To use this program with your...

Free Open Source Linux Xfce
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3 Like
blat

Blat is a small, efficent SMTP command line mailer for Windows. It is the SMTP *sending* part of an eMail User Agent (MUA) or eMail client. As such, Blat sends eMail via...

Free Open Source Windows
Command line interface Scripting Add a feature

8 Like
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...

Free Open Source Linux BSD Self-Hosted
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3 Like
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...

Free Open Source Mac Linux BSD Self-Hosted
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7 Like
Dragonfly Mail Agent

A small Mail Transport Agent (MTA), designed for home and office use. Part of http://alternativeto .

Free Open Source Linux BSD
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3 Like
Sendmail

Sendmail is a general purpose internetwork email routing facility that supports many kinds of transfer and delivery methods, including the Simple Mail Transfer Protocol...

Free Open Source Mac Linux
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3 Like
Microsoft SMTP Server

Configure SMTP e-mail in IIS when you want to deliver e-mail messages from your site. Mail can be delivered immediately or it can be delivered to a file location on disk...

Commercial Windows
Email Forwarding Add a feature

1 Like
Mailer

Free utility to send emails from the command line. No Installation. All contained in one file.

Free Windows Linux
Command line interface Add a feature

1 Like
sendEmail

sendEmail is a lightweight, command line SMTP email client. If you have the need to send email from a command line, this free program is perfect: simple to use and...

Free Open Source Mac Windows Linux
Command line interface Scripting Add a feature

1 Like
Hectane

An SMTP client that is extremely easy to configure and use, providing a simple HTTP API that is used for sending emails.

Free Windows Linux
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2 Like
CMail

CMail is a command line mailer, originally developed for testing mail server software, but is simple enough to use interactively. CMail supports IPv6, TLS/SSL...

Free Windows
Command line interface Support for IPv6 Scripting Add a feature

1 Like
NikaMail

NikaMail is a portable, extendable, zero-config email server. It is designed to perform automation tasks, provide access to mailboxes (port 110), serve as a mail...

Free Open Source Mac Linux
Exchange email POP3 Support Add a feature

1 Like
BulkMTA

BulkMTA is Commercial Mail Server Similar to PowerMTA. IP Rotation, DKIM, Sender / Receiver Rate limiting

Commercial Mac Windows Linux
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0 Like