By 2029, certificate lifetimes will drop to 47 days.
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.
Free Email certificates from COMODO. Our free email certificates with digital signature ensure confidentiality and privacy. Get free (S/MIME) Certificates.
[LetsEncrypt and ZeroSSL certificates are only for domain validation (web/server encryption).]
You can upload your own certificate.
These are recognized by MSIE now, for error-free SSL. great for free email certs too
