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Tugzrida / mta-sts.js
Last active May 31, 2024 06:56
MTA-STS Cloudflare worker
// This worker is designed to be able to neatly handle MTA-STS policies for multiple domains.
// Make a new worker with this script and add your domains to the stsPolicies dict like the example.
// Add a DNS AAAA record for mta-sts.yourdomain.com pointing to 100:: and set to proxied,
// then add a workers route for mta-sts.yourdomain.com/* pointing to this worker.
// You should probably also create a Cloudflare configuration rule disabling Browser Integrity Check for the mta-sts subdomain
// to ensure MTAs aren't blocked from retrieving your policy.
// You'll still need to manually add the appropriate _mta-sts.yourdomain.com TXT record to enable the policy,