Microsoft SMTP Server

Configure SMTP e-mail in IIS when you want to deliver e-mail messages from your site.

AltMails

Disposable temporary email addresses that you can use when signing up on websites to protect your identity and prevent your personal email address from being sold or spammed.

BulkMTA

BulkMTA is Commercial Mail Server Similar to PowerMTA.

Courier-MTA

The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open…

Eskiimo

Send emails to anyone, anonymously

Exim

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

Haraka

Open source SMTP server written in Node.js

Hectane

Lightweight, cross-platform SMTP client

Horde

Horde Groupware is a free, enterprise ready, browser based collaboration suite.

Mail-in-a-box

Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.

MailEnable

MailEnable is a Windows based mail server and email server program that is packed with the state of the features and functions like antivirus and spam filtering system, webmail management system, cardDAV, CalDAV and much more.

NikaMail

NikaMail is a portable, extendable, zero-config email server.

OpenSMTPD

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

PowerMTA

PowerMTA is an industrial-strength software for high-volume email delivery.

Roundcube

Web-based IMAP email client

SendInBlue

Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.

Squirrelmail

SquirrelMail is a standards-based webmail package written in PHP.

esmtp

esmtp is a user configurable relay-only Mail Transfer Agent (MTA) with a sendmail compatible syntax.

msmtp

msmtp is an SMTP client.

18 Alternatives To Microsoft SMTP Server