Web, domains and email
MTA-STS
Abbreviation for Mail Transfer Agent Strict Transport Security
In short and in plain language
MTA-STS is a method that a domain uses to protect its incoming email.
It says that email sent to the domain should only arrive encrypted.
The rule is published with the domain. It names the mail servers that are allowed.
If the mail server changes, the rule should be changed in good time.
Definition
MTA-STS is a method by which a domain specifies that email sent to it should only be delivered encrypted. The policy is published with the domain and names the permitted mail servers. When the mail server changes, it should therefore be adjusted in good time.