https://app.knowbase.one/vault/rfc/docid/2751
RFC2476: Message Submission
Network Working Group R. Gellens Request for Comments: 2476 QUALCOMM Category: Standards Track J. Klensin MCI ...
https://app.knowbase.one/vault/rfc/docid/5311
RFC4865: SMTP Submission Service Extension for Future Message Release
Network Working Group G. White Request for Comments: 4865 Independent Updates: 3463, 3464 G. Vaudreuil Category: Standards Track Alcatel-Lucent ...