%% You should probably cite rfc7293 instead of this I-D. @techreport{ietf-appsawg-rrvs-header-field-09, number = {draft-ietf-appsawg-rrvs-header-field-09}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-ietf-appsawg-rrvs-header-field/09/}, author = {William Mills and Murray Kucherawy}, title = {{The Require-Recipient-Valid-Since Header Field and SMTP Service Extension}}, pagetotal = 23, year = 2014, month = mar, day = 25, abstract = {This document defines an extension for the Simple Mail Transfer Protocol called RRVS, and a header field called Require-Recipient- Valid-Since, to provide a method for senders to indicate to receivers a point in time when the the ownership of the target mailbox was known to the sender. This can be used to detect changes of mailbox ownership, and thus prevent mail from being delivered to the wrong party. The intended use of these facilities is on automatically generated messages, such as account statements or password change instructions, that might contain sensitive information, though it may also be useful in other applications.}, }