[JAMES-3823] Implement RFC-8689 RequireTLS

• Type: Sub-task
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: SMTPServer
• Assignee: Unassigned
• Reporter: Benoit Tellier
• Created: 26/Sep/22 06:56
• Updated: 26/Sep/22 06:57

Description

Implement https://datatracker.ietf.org/doc/rfc8689/

Abstract:

   The SMTP STARTTLS option, used in negotiating transport-level
   encryption of SMTP connections, is not as useful from a security
   standpoint as it might be because of its opportunistic nature;
   message delivery is, by default, prioritized over security.  This
   document describes an SMTP service extension, REQUIRETLS, and a
   message header field, TLS-Required.  If the REQUIRETLS option or TLS-
   Required message header field is used when sending a message, it
   asserts a request on the part of the message sender to override the
   default negotiation of TLS, [..] by requiring that TLS be
   negotiated when the message is relayed [..].

Use it on the `smtpserver.xml` `requireSSL` option...