Secure Email Transmission Protocols -- A New Architecture Design. (arXiv:2208.00388v1 [cs.CR])

During today's digital age, emails have become a crucial part of
communications for both personal and enterprise usage. However, email
transmission protocols were not designed with security in mind, and this has
always been a challenge while trying to make email transmission more secure. On
top of the basic layer of SMTP, POP3, and IMAP protocols to send and retrieve
emails, there are several other major security protocols used in current days
to secure email transmission such as TLS/SSL, STARTTLS, …

architecture design email protocols