A fast, highly extensible, and event driven SMTP server

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

Command line utility and a Node.js library for email authentication

Hermes Secure Email Gateway is a Free Open Source Ubuntu 20.04 LTS Server based Email Gateway that provides Spam, Virus and Malware protection, full in-transit and at-rest email encryption as well as email archiving. It features the latest email authentication techniques such as SPF, DKIM and DMARC.

SPF plugin for Haraka

Cloudflare Worker to send emails using MailChannels with DMARC

Node.js wrapper around Python's spf.check2 function which conforms to both RFC4408 and RFC7208

Artisanal inbound emails for every web app using nodejs

SPF validator

This module provides a simple interface to validate if an IP address is a valid sender for a given email domain.

📧 Parse SPF (sender policy framework) records

Express middleware that handles SPF requests

ThunderSec is a security plugin for Mozilla Thunderbird that creates several pieces of additional security functionality, including DNSBL, RBL, SURBL, DKIM and SPF.