My source is the IETF, and every issue is a semantic issue. I did searches for bounce and DSN on a bunch of RFCs, and they all agreed. In particular, thr RFC that you cited, 3464, lists DSN types that are not bounces.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of Grant Taylor <0000023065957af1-dmarc-requ...@listserv.ua.edu> Sent: Sunday, August 30, 2020 11:33 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Sending email from the Mainframe On 8/29/20 6:50 PM, Seymour J Metz wrote: > According to the IETF, every bounce is a DSN but not every DSN is a bounce. Would you please cite your source? I also wonder if we're having somewhat of a semantic issue. I'm specifically referring to a bounce (which is a superset of the latter) that is formatted per RFC 3464 -- An Extensible Message Format for Delivery Status Notifications (which is a subset of the former). Per RFC 3462 § 2 — Format of a Delivery Status Notification — A DSN is a MIME message with a top-level content-type of multipart/report (defined in [REPORT]). When a multipart/report content is used to transmit a DSN: (a) The report-type parameter of the multipart/report content is "delivery-status". (b) The first component of the multipart/report contains a human-readable explanation of the DSN, as described in [REPORT]. (c) The second component of the multipart/report is of content-type message/delivery-status, described in section 2.1 of this document. (d) If the original message or a portion of the message is to be returned to the sender, it appears as the third component of the multipart/report. Not all bounces conform to these specifications, ergo not all bounces are a DSN (as specified by RFC 3462). All (failure) DSNs are bounces. Aside: I guess there are also success DSNs. I don't know if they would be considered a bounce or not. They are an email about the delivery of another email, thus fall into the category of bounce like email. -- Grant. . . . unix || die ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
