OpenSMTPD
OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with some additional standard extensions. It allows ordinary machines to exchange e-mails with other systems speaking the SMTP protocol.
Dragonfly Mail Agent
A small Mail Transport Agent (MTA), designed for home and office use. Part of DragonFly BSD , it accepts mails from locally in ...
sSMTP
SSMTP is a program which delivers email from a local computer to a configured mailhost (mailhub). It is not a mail server (lik ...
Inbucket
Need to test your webapps outbound emails with Mailinator but stuck behind a firewall? Want to keep the new application you ar ...
Haraka
Haraka is an open source SMTP server written in Node.js which provides extremely high performance coupled with a flexible plug ...
NikaMail
Portable, extendable, zero-config email server for JVM and Ruby.
- Portable Just copy and run. Only dependency is Java. Need to ...
Microsoft SMTP Server
Available in Windows and Windows Server via the optional IIS role. Configure SMTP e-mail in IIS when you want to deliver e-mai ...
Sendmail
Sendmail is a general purpose internetwork email routing facility that supports many kinds of transfer and delivery methods, i ...
Go-Guerrilla
It's an SMTP server written in Go, for the purpose of receiving large volumes of email. It started as a project for GuerrillaM ...
Courier-MTA
The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols, such as ESMTP, ...
Exim
Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Inter ...
Postfix
Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail. It attempts to be fast, easy to administer, a ...
Lettre
Lettre provides the following features: Multiple transport methods Unicode support (for email content and addresses) Secure de ...