MTA-STS (full name SMTP Mail Transfer Agent Strict Transport Security) is a new standard that aims to improve the security of SMTP by enabling domain names to opt into strict transport layer security mode that requires authentication (valid public certificates) and encryption (TLS). In this blog post we discuss why MTA-STS exists and how it's used, as well as announce full support for its most recent draft in Hardenize.
Looks like the secret sauce is DANE, a.k.a. opportunistic TLS.
In 2022, enabling it seems to help with getting filtered as spam by Google servers.
We review eight HIPAA compliant email vendors who provide HIPAA compliant email encryption services that will keep your information safe when in transit.
Gotta have transit encryption, at least, where supported.
