esmtp Alternatives

msmtp is an SMTP client.

sSMTP is a simple MTA to deliver mail from a computer to a mail server.

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Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.

sendEmail is a lightweight, command line SMTP email client.

Open Source

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

Open Source

mailsend-go is a command line tool to send mail via SMTP protocol, written with golang.

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

Open Source

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

Open Source

SMTP provides scalable affordable email infrastructure for all your sending needs.

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

Blat is a small, efficent SMTP command line mailer for Windows.

Mutt is a small but very powerful text-based mail client for Unix operating systems.

CMail is a free Windows command line mailer with advanced message formatting options.

free