What is MTA-STS and how does it secure email in transit?
MTA STS secures messages during transit between sending and receiving mail servers. It does not secure content at rest. It enforces:
A TLS encrypted connection.
A trusted certificate issued by a recognized authority.
A policy that tells other servers exactly how to interact securely.
If a server cannot meet these conditions the message is not delivered. It focuses entirely on server to server SMTP transport and does not modify how users themselves access their mailbox.
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