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.

Free
Open Source
Mac OS X
Linux
BSD
Self-Hosted

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. individual components can be customized, enabled or disabled at will.

certain portions of the courier mail server the mail filtering engine, the webmail server and the imap server are also available as separate, smaller, packages that can be used with other mail servers.

Links to official Courier-MTA sites

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The Best 11 Courier-MTA Alternatives

21 Like

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.

Free Open Source Mac OS X Linux
12 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 OS X Windows Linux
3 Like

Dragonfly Mail Agent

a small mail transport agent (mta), designed for home and office use. part of http://alternativein .

Free Open Source Linux BSD
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 (SMTP) used for email transport over the Internet.

Free Open Source Mac OS X Linux
2 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
2 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
1 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
1 Like

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....

Free Open Source Linux
1 Like

PowerMTA

Email gateway application (SMTP server) that makes it easy for senders to adopt the latest authentication specifications ( SPF and DKIM) to comply with changing ISP...

Commercial Windows Linux Self-Hosted
0 Like

EmailSuccess

EmailSuccess, an advanced SMTP Server (MTA) built from the ground up to handle the most critical reliability, performance, security, and deliverability requirements.

Commercial Linux

Encrypted email Email deliverability

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Courier-MTA

Links to official Courier-MTA sites

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The Best 11 Courier-MTA Alternatives

Postfix

Exim

Dragonfly Mail Agent

Sendmail

OpenSMTPD

Hectane

Microsoft SMTP Server

sSMTP

PowerMTA

EmailSuccess

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