The Require-Recipient-Valid-Since Header Field and SMTP Service Extension (RFC7293)
Original Publication Date: 2014-Jul-01
Included in the Prior Art Database: 2014-Jul-04
Internet Society Requests For Comment (RFCs)
W. Mills: AUTHOR [+2]
Email addresses sometimes get reassigned to a different person. For example, employment changes at a company can cause an address used for an ex-employee to be assigned to a new employee, or a mail service provider (MSP) might expire an account and then let someone else register for the local-part that was previously used. Those who sent mail to the previous owner of an address might not know that it has been reassigned. This can lead to the sending of email to the correct address but the wrong recipient. This situation is of particular concern with transactional mail related to purchases, online accounts, and the like.
Internet Engineering Task Force (IETF) W. Mills Request for Comments: 7293 Yahoo! Inc. Category: Standards Track M. Kucherawy ISSN: 2070-1721 Facebook, Inc. July 2014
The Require-Recipient-Valid-Since Header Field and SMTP Service Extension
This document defines an extension for the Simple Mail Transfer Protocol (SMTP) called "RRVS" to provide a method for senders to indicate to receivers a point in time when 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. This document also defines a header field called "Require-Recipient-Valid-Since" that can be used to tunnel the request through servers that do not support the extension.
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.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7293.
Mills & Kucherawy Standards Track [Page 1]
RFC 7293 Require-Recipient-Valid-Since July 2014
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