Free utility to send emails from the command line. No Installation. All contained in one file.
Cost / License
- Free
- Proprietary
Platforms
- Windows
- Linux
sSMTP is described as '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. Unlike Exim4, sSMTP does not receive mail, expand aliases, or manage a queue' and is an app in the office & productivity category. There are more than 10 alternatives to sSMTP for a variety of platforms, including Linux, Windows, Mac, BSD and Self-Hosted apps. The best sSMTP alternative is Postfix, which is both free and Open Source. Other great apps like sSMTP are Exim, OpenSMTPD, CMail and Sendmail.
Free utility to send emails from the command line. No Installation. All contained in one file.
An SMTP client that is extremely easy to configure and use, providing a simple HTTP API that is used for sending emails.
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 transfer agent (port 587) and mail exchange service (port 25). NikaMail supports TLS.




SMTPc is simple SMTP client for easy mail sending using CLI. It's dedicated for developers, however it's easy to use and every CLI user will be satisfied using this.
BulkMTA is Commercial Mail Server Similar to PowerMTA. IP Rotation, DKIM, Sender / Receiver Rate limiting.
You can send the mails via an smtp server, such as blat, supports authentication and ssl. In addition, he can also send emails via the OWA interface (i.e. the Exchange Server can also be used for external sending if the OWA is published).