Editing Simple Mail Transfer Protocol (section)

====SMTP MTA Strict Transport Security====
A newer 2018 {{IETF RFC|8461|}} called "SMTP MTA Strict Transport Security (MTA-STS)" aims to address the problem of active adversaries by defining a protocol for mail servers to declare their ability to use secure channels in specific files on the server and specific [[Domain Name System|DNS]] TXT records. The relying party would regularly check existence of such record, and cache it for the amount of time specified in the record and never communicate over insecure channels until record expires.<ref name=":0" /> Note that MTA-STS records apply only to SMTP traffic between mail servers while communications between a user's client and the mail server are protected by [[Transport Layer Security]] with SMTP/MSA, IMAP, POP3, or [[HTTPS]]<!-- do we need the protocols here? --> in combination with an organizational or technical policy. Essentially, MTA-STS is a means to extend such a policy to third parties.

In April 2019 [[Google Mail]] announced support for MTA-STS.<ref name=":1">{{Cite web|url=https://www.zdnet.com/article/gmail-becomes-first-major-email-provider-to-support-mta-sts-and-tls-reporting/|title=Gmail becomes first major email provider to support MTA-STS and TLS Reporting|last=Cimpanu|first=Catalin|website=ZDNet|language=en|access-date=2019-04-25|archive-date=April 29, 2019|archive-url=https://web.archive.org/web/20190429022852/https://www.zdnet.com/article/gmail-becomes-first-major-email-provider-to-support-mta-sts-and-tls-reporting/|url-status=live}}</ref>