On Tuesday, November 14, 2023 3:39:53 AM CET Taylor R Campbell wrote: > Unless anything has changed in the past couple years, I don't think > there is any widespread deployment of SMTP TLS server authentication > that means anything for general MTAs -- at best, TLS in SMTP serves as > opportunistic encryption to defend against passive eavesdroppers.
MTA-STS, the equivalent to HTTP's HSTS, is support for all outgoing mail by at least Google Mail and Outlook, which covers a significant chunk of all mails. Joerg
