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# security → email → configuration → spoofing → open-source

1 link tagged with all of: security + email + configuration + spoofing + open-source

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GitHub - CERT-Polska/mailgoose: A web application that allows the users to check whether their SPF, DMARC and DKIM configuration is set up correctly.

Mailgoose is a tool for verifying SPF, DMARC, and DKIM settings to help prevent email spoofing. Developed by CERT PL, it supports Polish institutions in configuring their domains correctly. The app relies on libraries like checkdmarc and dkimpy.
Saved by <a href="/u/tldr-importer">tldr-importer</a> · Last saved February 14, 2026 · 1 min read
email ✓ configuration ✓ spoofing ✓ security ✓ open-source ✓