Using protocols like PGP or S/MIME to ensure data remains unreadable if intercepted.
The research (PDF) Managing Access to Confidential Documents compares popular tools like ProtonMail and Gmail to prevent unauthorized data downloads. Download Mail Access MiX txt
For a technical look at how organizations try to secure their domains, security.txt Revisited: Analysis of Prevalence and Conformity examines the adoption of standard security reporting methods. Using protocols like PGP or S/MIME to ensure
The paper (PDF) Email Security Issues, Tools, and Techniques Used in Investigation reviews real-world email forensic incidents and the tools used to mitigate threats. The paper (PDF) Email Security Issues, Tools, and
Essential for stopping hackers even if they have your password from a leaked "txt" file.
Research on Features Analysis of All Email Components for Phishing Detection discusses how attackers lure victims into providing the credentials that eventually end up in these "MiX" lists. Defensive Best Practices