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GNU Mailutils is an open-source collection of mail utilities and libraries for Unix-like systems, including command-line tools that send and process email. It is aimed at administrators and developers who need broader local mail handling than Mailsend provides.
Postfix is an open-source mail-transfer agent used to send, receive, and relay email on Unix-like systems. It is designed for secure, reliable...
Free, open source
cURL is a command-line tool and library for transferring data with URLs. It supports various protocols and is widely used for automation,...
msmtp is a simple and efficient mail transfer agent with support for various authentication methods and encryption. It is a reliable solution...
mailsend-go is an open-source command-line SMTP client written in Go for scripts, automation, and system administrators. It supports authenticated SMTP delivery, TLS,...
Free (open source)
Mailsend is an open-source command-line SMTP client for sending email from Windows, Linux, and other Unix-like systems. It supports SMTP authentication, TLS/SSL,...
Free, open source
John Jetmore
Swaks is a command-line SMTP testing, diagnostics, and email-sending utility for system administrators and developers. It supports authentication, TLS, MIME content, attachments,...
Free, open source
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