ikkeben
Verified User
This but then for Directadmin and several OS?
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How To Configure MTA-STS and TLS Reporting for Your Domain Using Apache on Ubuntu 18.04 | DigitalOcean
Mail Transport Agent Strict Transport Security, MTA-STS, is a new internet standard that allows you to enable strict force-TLS for email sent between support…

Introducing MTA Strict Transport Security (MTA-STS) | Hardenize Blog
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).


MTA-STS - dmarcian
MTA-STS is an inbound mail protocol designed to add a layer of encryption/security between sending and receiving mail servers.

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