On Fri, 02 May 2014, Santiago Vila wrote: > severity 500965 normal > thanks > > For a lot of years this has not been a big problem, but now Yahoo and > others are using a policy called DMARC (built on top of DKIM and SPF) > and at least Yahoo is actually rejecting messages failing these kind > of digital signatures. > > The following text comes from DMARC FAQ: > > (see http://dmarc.org/faq.html#s_3) > > I operate a mailing list and I want to interoperate with DMARC, what > should I do? > > 1. Operate strictly as a "forwarder," where the RFC5321.RcptTo field > is changed to send the message to list members, but the RFC5322 > message headers and body are not altered. > > Pros: > > Receiving systems can validate the DKIM signature of the message > author, if one was present. > > Cons: > > Senders that depend solely on SPF for authentication will still > fail. Precludes many customary features of mailing lists, such as > "Subject:" tags, list footers/disclaimers, etc. > > (There are other solutions, but I don't think you will want to append > ".INVALID" to every yahoo.com address in a From: line). > > > Debian lists have always kept the Subject unmodified, so this is not a > problem for us. The main problem is that we add footers to every > message. Example: > > To UNSUBSCRIBE, email to [email protected] > with a subject of "unsubscribe". Trouble? Contact [email protected] > Archive: https://lists.debian.org/etc > > Messages already have RFC-2369 conformant headers for the unsubscribe > information, namely: > > List-Unsubscribe: > <mailto:[email protected]?subject=unsubscribe> > > For the "Trouble?" part we already have the "List-Help:" header. > > What's left? The Archive information. As this is a single line, this > could be modified to be a header as well: > > X-Debian-Archive: https://lists.debian.org/etc > > > To summarize: While it could be fancy and "nice" to have such > information in the body, and many mailing lists often do this, > by doing so we are breaking interoperability with other email > systems. I propose that we stop doing that by not using footers > in our lists. > > > The other solution is to change the From: address in the body (which > is called "RFC5322.From" header in current documentation) but that > would break direct replies. > > Maybe this would be needed for lists like debian-devel-changes, where > the email is actually originated at ftp-master: > > From: Somebody <somebody at example.com> God no. DMARC is just broken by design. We should no in any way support it.
Alex -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
