spf

A fast, highly extensible, and event driven SMTP server

An email spoofing testing tool that aims to bypass SPF/DKIM/DMARC and forge DKIM signatures.🍻

Simple script that checks a domain for email protections

SPFtoolbox is a Javascript and PHP app to look up DNS records such as SPF, MX, Whois, and more

Shell scripts for taming the SPF (Sender Policy Framework) records in order to fight 10-maximum-DNS-look-ups limit.

Scan domains and return data based on trustworthy email best practices

A parser for SPF and DMARC DNS records

A Go library and tools for DKIM, DMARC and Authentication-Results

A simple, open source Mac OS app for presentations on low-contrast monitors.

Internet.nl toolbox - how-to's for modern mail security standards (DMARC, DKIM, SPF and DANE)

Postfix SMTP relay docker image

Internet standards compliance test suite

A set of browser-based DNS tools for DigitalOcean Community.

Convert dmarc reports from xml to human-readable formats

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

Library containing Email related implementations in Elixir : dkim, spf, dmark, mimemail, smtp

Artisanal inbound emails for every web app using nodejs

Postfix SRS forwarding agent

Simple library to check an IP address against a domain's SPF record

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

Setup guide for Office 365 Administrators who are unable to use ATP to configure SPF, DKIM and DMARC.

Another utility to analyze state of deployment of security-related email protocols.

Ruby SPF Parser

Hermes Secure Email Gateway is a Free Open Source Ubuntu 18.04 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.

Compact large SPF chains into flat blocks of IP addresses

Parse SPF record and determine if client IP is allowed to send email.

Simple script that checks a domain for email protections

Sender Policy Framework

PowerShell Script for checking SPF, DKIM and DMARC-record.