starttls

Transparent SSL/TLS interception

An Internet scale, blazing fast SSL/TLS scanner ( non-blocking, event-driven )

Internet standards compliance test suite

Scan domains and return data based on trustworthy email best practices

proxy poc implementation of STARTTLS stripping attacks

The highly customizable ruby SMTP-Server and SMTP-Service library with builtin support for AUTH and SSL/STARTTLS, 8BITMIME and SMTPUTF8, IPv4 and IPv6 and additional features.

📩 Template to host an MTA Strict Transport Security (MTA-STS) policy on GitHub Pages.

A minimalist client for sending mail direct to recipient's MX

🛠️ Proof-of-concept code for Heartbleed a.k.a. CVE2014-0160 with STARTTLS support for various protocols

'DANE for SMTP' wiki

Check expiry dates of local and remote SSL certificates

🐦‍⬛ SMTP for AI agents. No middleman.

(START-)TLS-capable transport using OpenSSL for asyncio

TLSAudit is a utility for auditing TLS (including SSL and STARTTLS) security settings.

Application that creates a dashboard for scans using the Internet.nl API.

Ultrafast SMTP and LMTP server library for Bun

Small Python Script for Testing TLS/SSL Functionality of Mail Server

MITM proxy for TCP/TLS/DTLS/UDP traffic, with STARTTLS, IoT, Thick Client and more.

TLS handshake benchmarking tool that supports TCP and SMTP

SMTP pure PHP Mail Daemon (!!! Alpha project !!!)