spf topic
checkdmarc
A parser for SPF and DMARC DNS records
postfix-relay
Postfix SMTP relay docker image
mailauth
Command line utility and a Node.js library for email authentication
node-mailin
Artisanal inbound emails for every web app using nodejs
mailibex
Library containing Email related implementations in Elixir : dkim, spf, dmark, mimemail, smtp
Internet.nl
Internet standards compliance test suite
dns-tool
A set of browser-based DNS tools for DigitalOcean Community.
spf
A simple, open source Mac OS app for presentations on low-contrast monitors.
toolbox-wiki
Internet.nl toolbox - how-to's for modern mail security standards (DMARC, DKIM, SPF and DANE)
mailspfchecker
A Laravel package to check if you can send e-mail through a given mailserver in name of a given e-mail address