Mailer

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

15 Alternatives To Mailer

CMail

CMail is a command line mailer, originally developed for testing mail server software, but is…
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Courier-MTA

The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open…
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Evolution

Apps/Evolution - GNOME Wiki!

Exim

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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Haraka

Open source SMTP server written in Node.js

Hectane

Lightweight, cross-platform SMTP client

Mail-in-a-box

Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.

Mutt

Add forums and commenting to your site. Unlimited posts, users and traffic, for free. Embeddable, styleable and scriptable.

NikaMail

NikaMail is a portable, extendable, zero-config email server.

OpenSMTPD

OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with…

PowerMTA

PowerMTA is an industrial-strength software for high-volume email delivery.

esmtp

esmtp is a user configurable relay-only Mail Transfer Agent (MTA) with a sendmail compatible syntax.
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iMail

Fast, safe, heavy mail solution.

msmtp

msmtp is an SMTP client.
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sendEmail

sendEmail is a lightweight, command line SMTP email client.