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MTA-STS and TLS-RPT

MTA-STS and TLS-RPT are security-type mechanisms that go hand-in-hand which we use to make declarations to other Mail Servers (via DNS) that we only want to accept encrypted connections for MTA transactions.

It tells others that they shouldn't try deliver mail to us if a secure TLS connection can't be established to our Mail Servers. For this to be effective, you must first configure DNSSEC.

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