mastodon.social MTA-STS Policy Check

What is MTA-STS for mastodon.social?

MTA-STS (Mail Transfer Agent Strict Transport Security) is a mechanism that allowsmastodon.social to declare that it supports TLS encryption and that sending servers should refuse to deliver email over plaintext connections. It is published through a DNS TXT record at _mta-sts.mastodon.social and a policy file hosted at https://mta-sts.mastodon.social/.well-known/mta-sts.txt. When configured in enforce mode, MTA-STS prevents man-in-the-middle attacks that strip TLS encryption from email in transit.

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