What is SPFtoolbox?

A JavaScript and PHP web application for analyzing DNS records through a simple web interface. It looks up A/AAAA records, MX records, SPF/TXT records, DMARC policies, email blacklist status, WHOIS information, open port checks, hardware info (HINFO), reverse DNS lookups, and bulk DNS queries. Designed as a free, open-source alternative to services like MXToolbox. Runs on any PHP 5.3+ web server with no database required. Installation is as simple as uploading the release files to a web server. Also offers a YunoHost one-click install and a Heroku deploy button. Includes a dark mode toggle and a Chrome extension.

Should you self-host SPFtoolbox?

SPFtoolbox scores 46/100 on selfhost.directory (how scoring works) and ranks #17 of 20 in Network Utilities. It has 299 GitHub stars.

There was no stable release in the past 12 months, so check the repository's recent activity before you rely on it.

Setup is easy: most people get it running in one sitting. It is MIT-licensed and written mostly in PHP.

Its closest alternative on selfhost.directory is MyIP (75/100, 12 241 stars). It scores higher overall, so compare the two before you pick. See SPFtoolbox vs MyIP side by side.