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.

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.

CMail is a command line e-mail sending tool. It was originally developed to assist with testing mail server and content analysis software. As a result, CMail provides many more message formatting and SMTP session control options than similar software.

Blat is a small, efficent SMTP command line mailer for Windows. It is the SMTP sending part of an eMail User Agent (MUA) or eMail client. As such, Blat sends eMail via SMTP (or internet eMail) from the command line, or CGI.
Postmark is a fast and reliable transactional email service. Send with Postmark to ensure your transactional emails get to the inbox on time, every time.

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.
A small Mail Transport Agent (MTA), designed for home and office use. Part of DragonFly BSD , it accepts mails from locally installed Mail User Agents (MUA) and delivers the mails either locally or to a remote destination.
DNS Made Easy offers enterprise managed DNS and geographical load balancing services on a global IP Anycast DNS network with a 100% uptime guarantee.
Unified Identity Services across data center, cloud and mobile — one single login for users and one unified identity infrastructure for IT.




MailEnables mail server software provides a powerful, scalable hosted messaging platform for Microsoft Windows.
Pandora Mail is Windows desktop e-mail client used to access POP3/IMAP mailboxes and to send mail via standard SMTP protocol.

Get a web based email/messaging, HTTP proxy, files server, VPN administration interface Using Postfix, Squid, Samba And extend them with Security quickly and easily How to create a Mail/Proxy/File



mailsend-go is a command line tool to send mail via SMTP protocol. This is the golang incarnation of the C version of mailsend. However, this version is much simpler and all the heavy lifting is done by the package gomail.v2
Scanigma offers a comprehensive solution that includes in-depth analysis, evaluation and reporting of security settings, specific recommendations, sample configurations and ongoing monitoring.

SMTP Zen is high-deliverability SMTP and professional email with unlimited domains, guided SPF/DKIM/DMARC, and real-time logs.

Zynk is an Integration and Business Automation platform which is installed on your Windows server and allows you to create custom workflows to automate Data Integration tasks, Create Dashboards, Automate Reporting, PDF Generation and much more with little or no coding required.



SMTP2GO is an email service provider, performing the task of reliably delivering transactional and marketing emails, and providing reporting tools to track and visualize what is happening with outgoing emails.
High security web-based e-mail system which extends considerably the email system to much more than currently exists.
Platformly is a powerful yet easy to use business management and marketing automation tool for busy business owners who are focused on growth.




Ethereal is a fake SMTP service, mostly aimed at Nodemailer users (but not limited to). It's a completely free anti-transactional email service where messages never get delivered.


Discover the rich features in PowerMTA that help you adopt and adapt to changing email authentication standards including support for DKIM and SPF and setup for DMARC via an automated testing tool.

Biggest web hosting account around. 750 GB webspace, 7500 GB monthly data transfer and unlimited email accounts.