An email and SMTP testing tool with API for developers

Simple Golang SMTP relay/proxy server

The collaborative Open Source successor to qmail and netqmail

The first Open-Source high-performance MTA developed from the ground-up for high-volume email sending environments.

Lightweight SMTP relay Docker image using msmtpd

Simple mail relay that can take unauthenticated SMTP emails (e.g. over port 25) and relay them to authenticated, TLS-enabled SMTP servers.

Docker image running a SMTP relay with postfix

SpamPD - Spam Proxy Daemon. A spam-filtering SMTP/LMTP proxy server using SpamAssassin in Perl. Since 2002.

Postfix Docker Image with great flexibility

SMTP server and SMTP relay host

SMTP Open Relay Exploitation

AWS-hosted personal email system: sending, receiving, storage, and forwarding (relaying). `notmuch` client. JMAP server WIP.

SMTP server to use for forwarding messages

PHP SMTP Mailer library implemented by socket

GoLang SMTP server and client implementation

Synchronous Concurrent Relay and Mailer Daemon

Minimal SMTP server/relay, works natively on Kubernetes

Docker WordPress images optimized for production

Free SMTP Server