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+                 Internet Mail Delivery Protocol
+
+The objective of Internet Mail Delivery Protocol (IMDP) is to deliver
+mail between mail servers reliably, securely and efficiently.  This
+document is an informal specification of IMDP.
+
+IMDP is the mail delivery protocol of the Internet Mail Architecture,
+which addresses the communication of mail between mail servers.  It is
+not complete by itself.  Seperate protocols are being developed to
+address mail submission, and mail retrieval between user agents and mail
+servers.  The format of mail data transferred with IMDP is also
+documented seperately.
+
+The Internet long had existing mail delivery protocols, such as the
+Simple Mail Transfer Protocol.  However, due to the lack of security
+considerations, countless amendments have been added to the protocol
+such as SMTP over TLS, DMARC, DKIM, and SPF.  In particular, TLS is used
+for secure transport, while DMARC, DKIM, and SPF are used for domain
+name authentication.  However, this combination is complicated and is
+cumbersome to maintain, especially with its heavy dependence on DNS.
+This protocol attempts to address these coherently.
+
+The Internet Mail Delivery Protocol works over TLS TCP.  At the request
+of a user, the sending IMDP server server establishes a TLS bytestream
+to the receiving IMDP server, based on the hostpart of the recipients of
+the mail.  The TLS connection MUST use a TLS client certificate,
+recognized in the X.509 public key infrastructure (e.g. signed by a
+certificate authority), that corresponds to the domain of the return
+path, as in the return path's hostpart is in the TLS client
+certificate's commonName or subjectAltName.  The sending-IMDP then sends
+a IMDP mail data's headers, in the IMDP mail format.  The receiving-IMDP
+verifies the validity of the mail headers, for example, whether the
+sending-IMDP is authorized to send mail for the domain indicated in the
+headers.  If the receiving-IMDP can receive the mail as specified by the
+headers, the sending-IMDP sends the mail data.  If not, the
+receiving-IMDP rejects the mail with a reply specifying the reason.
+
+vim: textwidth=72 colorcolumn=72