Net-SSLeay: Perl bindings for OpenSSL and LibreSSL

Expect-lua for Windows ( A text-terminal automation tool similar to expect(1) using Lua )

An ad-hoc disposable temporary mail server. Create and use ad hoc disposable mailboxes for testing or any other purpose.

Create custom SMTP servers on the fly

Swaks - Swiss Army Knife for SMTP

Swaks - Swiss Army Knife for SMTP

dsmtpd is a small SMTP server for debugging and the developers.

The ultimate command line SMTP client

qpsmtpd is a flexible smtpd daemon written in Perl

A fast, highly extensible, and event driven SMTP server

Maildroid is a small robust android library for sending emails using SMTP server

✉️ Composable all-in-one mail server.

mailproxy is a simple SMTP proxy. It receives emails through an unencrypted, unauthenticated SMTP interface and retransmits them through a remote SMTP server that requires modern features such as e…

Disposable webmail server (similar to Mailinator) with built in SMTP, POP3, RESTful servers; no DB required.

Exim Mail Transport Agent - source, testsuite and documentation

lightweight, command line SMTP email client

A simple SMTP Server for Testing purposes. Emails are stored in an in-memory database and rendered in a Web UI

JSON Meta Application Protocol Specification (JMAP)