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MTA-STS SMTP TLS

What you see when your domain has this problem
MTA-STS Policy MX Does not support TLS Details area Ignore

More Information About Mta-Sts Smtp Tls

This error indicates that the recipient MTA-STS policy MX does not support TLS. MTAs supporting an MTA-STS policy MUST have support for TLS 1.2 or higher, otherwise encryption will fail.

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