Note that while webmail obeys the earlier HTTP disposition of having s...
wikipedia - 13 Apr 2023Note that while webmail obeys the earlier HTTP disposition of having separate ports for encrypt and plain text sessions, mail protocols use the STARTTLS technique, thereby allowing encryption to start on an already established TCP connection. While RFC 2595 used to discourage the use of the previously established ports 995 and 993, RFC 8314 promotes the use of implicit TLS when available.
