[Mailman-Users] cause of bounces
gtaylor at tnetconsulting.net
Fri Oct 20 00:14:42 EDT 2017
On 10/18/2017 11:50 AM, Mark Sapiro wrote:
> This is the crux of our disagreement. The outbound message is still the
> original author's message, albeit slightly altered by subject prefixing,
> content filtering and/or other transformations to conform with list
> policies. I don't agree that it is a completely new message. I think it
> is still the original message with only technical and formatting changes.
RFC 6377 - DomainKeys Identified Mail (DKIM) and Mailing Lists,
disagrees with you. (RFC 6377 is also currently known as BCP 167.)
§ 3.2 calls this out specifically:
> resending: A resending MLM (see Sections 5.2 and 5.3 of [EMAIL-ARCH])
> is one that may make changes to a message. The output of such an MLM
> is considered to be a *new message*;
> *delivery of the original has been completed* prior to distribution of
> the reposted message. Such messages
> are often reformatted, such as with list-specific header fields or other
> properties, to facilitate discussion among list subscribers.
/The output of a resending MLM is/ *a new message*.
> MLM Output: *MLM* (sending its reconstructed copy of the originating user's
> message) *is Author*; MLM's ADMD is Originator and Signer; the ADMD of each
> subscriber of the list is a Verifier; each subscriber is a Receiver.
*The resending MLM is the author* /of the new message/.
> The dissection of the overall MLM operation into these two distinct phases
> allows the DKIM-specific issues with respect to MLMs to be isolated and
> handled in a logical way. The main issue is that the repackaging and
> reposting of a message by an MLM is actually the construction of a
> completely new message, and as such, the MLM is introducing new content
> into the email ecosystem, consuming the Author's copy of the message,
> and creating its own. When considered in this way, the dual role of the
> MLM and its ADMD becomes clear.
Since we have been talking about modifying more than /just/ the SMTP
envelope, we are indeed talking about a resending MLM and not an alias MLM.
Grant. . . .
unix || die
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