Microsoft SMTP Server!

Available in Windows and Windows Server via the optional IIS role.

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Microsoft SMTP Server alternatives


Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail. It attempts to be fast, easy to administer, and secure. The softwa...

tags: mail-server email-transfer e-mail-server mta electronic-mail
platform: Mac OS X Linux


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

tags: smtp mta message-transfer-agent
platform: Mac OS X Windows Linux


The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols, such as ESMTP, IMAP, POP3, LDAP, SS...

tags: imap smtp mail-server mailing-list mail-filter
platform: Mac OS X Linux BSD Self-Hosted

Atmail Email Server

Atmail webmail system offers a webmail client, email server platform and mailserver appliance for Linux, Unix and Windows.

tags: address-book business-email email-client email-sending exchange-calendar-sync
platform: Linux Online


Sendmail is a general purpose internetwork email routing facility that supports many kinds of transfer and delivery methods, including the Simple M...

tags: mail-server
platform: Mac OS X Linux

Dragonfly Mail Agent

A small Mail Transport Agent (MTA), designed for home and office use. Part of DragonFly BSD , it accepts mails from locally installed Mail User Age...

tags: smtp email-transfer message-transfer-agent
platform: Linux BSD


BulkMTA is Commercial Mail Server Similar to PowerMTA.IP Rotation, DKIM, Sender / Receiver Rate limiting

tags: mail-server mailing-list mailer
platform: Mac OS X Windows Linux


OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with some additional standard extensions. It allows ord...

tags: smtp smtp-server
platform: Linux BSD Self-Hosted

AtMail Open

AtMail is an open source webmail client written in PHP. We aim to provide a elegant Ajax webmail client for existing IMAP mailservers, with less bl...

tags: Discontinued multi-language webmail-service wysiwyg-editor
platform: Online Discontinued


SSMTP is a program which delivers email from a local computer to a configured mailhost (mailhub). It is not a mail server (like feature-rich mail s...

tags: mta smtp
platform: Linux


An SMTP client that is extremely easy to configure and use, providing a simple HTTP API that is used for sending emails.

tags: smtp outbound-smtp
platform: Windows Linux

ArgoSoft Mail Server

Powerful and simple SMTP/POP3/Finger server, with built in Web interface for accessing mail via Web browser. Supports security features, such as SM...

tags: mail-server smtp-server
platform: Windows