MTA

Exim

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

Sendmail

Sendmail is a general purpose internetwork email routing facility that supports many kinds of mail-transfer and delivery methods.

sSMTP

sSMTP is a simple and secure program for sending outgoing email from a computer to a mailhub.

Microsoft SMTP Server

Microsoft SMTP Server is a mail server that allows you to send and receive emails using the Simple Mail Transfer Protocol (SMTP). It is a part of Microsoft Exchange Server.

OpenSMTPD

OpenSMTPD is a free and open-source server-side SMTP implementation. It aims to be simple to set up, reliable, and secure.

Dovecot

Dovecot is an open-source IMAP and POP3 email server for Unix-like operating systems.

msmtp

msmtp is a simple and efficient mail transfer agent with support for various authentication methods and encryption. It is a reliable solution for sending emails from a computer.

blat

blat is a versatile software tool for managing projects and tasks efficiently.

CMail

CMail is a secure email client with advanced encryption features.

DBMail

DBMail is a fast and scalable open-source email storage system that supports IMAP and POP3. It is designed for high-volume email systems.

Postfix

Haraka

mailsend-go

KumoMTA