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MTA-STS
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Mangelot Hosting |
request for MTA-STS email policy
Mail Transport Agent Strict Transport Security (MTA-STS) is a new internet standard that allows you to enable strict force-TLS for email sent between supported email providers. It is similar to HTTP Strict Transport Security (HSTS), where a force-TLS policy is set and then cached for a specified amount of time, reducing the risk of man-in-the-middle or downgrade attacks.
Setup link: www.digitalocean.com/community/tutorials/how-to-configure-mta-sts-and-tls-reporting-for-your-domain-using-apache-on-ubuntu-18-04