Re: Mailing list membership.
Michael StJohns <mstjohns@comcast.net> Wed, 01 March 2017 18:55 UTC
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Subject: Re: Mailing list membership.
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From: Michael StJohns <mstjohns@comcast.net>
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Date: Wed, 01 Mar 2017 13:55:59 -0500
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Question below On 2/28/2017 11:49 PM, Theodore Ts'o wrote: > On Tue, Feb 28, 2017 at 05:29:24PM -0300, willi uebelherr wrote: >> related to the problem, what Khaled explained, what is your proposal? >> >> What are your "compatible with internet mailing lists" mail systems? > RFC 2821, Simple Mail Transfer Protocol, section 3.10.2 > > "To expand a list, the recipient mailer replaces the > pseudo-mailbox address in the envelope with all of the expanded > addresses. The return address in the envelope is changed so that all > error messages generated by the final deliveries will be returned to > a list administrator, not to the message originator, who generally > has no control over the contents of the list and will typically find > error messages annoying." > > This is the SMTP Envelope From field. The FROM field is not changed, > but the SMTP return address is changed, so that bounces go to the > mailing list administrator as opposed to the person who sends mail to > the mailing list. > > Unfortunately, if you are using a system whose domain requests that > all recipients enforce DMARC alignment, this specifically instructs > recipients to bounce mail if the SMTP Envelope return address doesn't > match the FROM field in the header. This means that they won't see > mailing list mail as defined by the IETF Standards Track RFC 2821, > which specifically says that is acceptable (and in fact a good thing) > to change the SMTP envelope return address so that bounces (caused by > people changing where they work, etc.) go to an administrator who can > deal with them. But if the mailing list administrators gets too may > bounces, and it's because the sending domain is requesting that mail > be bounced, the only thing they can do is to unsubscribe the sender or > the recipient. > > Hence mailing list systems that enforce DMARC, or request DMARC > processing, are fundamentally incompatible with mailing lists as > defined by section 3.10.2 of RFC 2821. > > If you want to participate in such mailing list, one of the best ways > is to change to a mailing list system that doesn't do DMARC. > > Best regards, > > - Ted > Thanks for the clear description of the problem - I admit that I got a similar one from folks at the Seoul IETF. In the short term, one thing I think would be helpful is to identify for the IETF participants which email providers are known to use DMARC and maybe also a list of providers that are known not to. Maybe add it to the IETF mailing list page at https://www.ietf.org/list/ with an explanation of what's been happening. Mike
- Re: Mailing list membership. John Levine
- Mailing list membership. Khaled Omar
- Re: Mailing list membership. S Moonesamy
- Re: Mailing list membership. willi uebelherr
- Re: Mailing list membership. willi uebelherr
- Re: Mailing list membership. willi uebelherr
- Re: Mailing list membership. willi uebelherr
- Re: Mailing list membership. S Moonesamy
- Re: Mailing list membership. Theodore Ts'o
- Re: Mailing list membership. willi uebelherr
- Re: Mailing list membership. Theodore Ts'o
- Re: Mailing list membership. Kazunori ANDO
- Re: Mailing list membership. Michael StJohns
- Re: Mailing list membership. Bob Hinden
- Re: Mailing list membership. willi uebelherr
- Re: Mailing list membership. Michael StJohns
- Re: Mailing list membership. Carsten Bormann
- Re: Mailing list membership. David Morris
- yet more DMARC stuff, was Re: Mailing list member… John Levine
- Re: Mailing list membership. willi uebelherr
- Re: Mailing list membership. Carsten Bormann
- Re: Mailing list membership. Barry Leiba
- Re: Mailing list membership. Miles Fidelman
- Re: [Mailman-Users] Fwd: Re: Mailing list members… willi uebelherr
- Re: [Mailman-Users] Fwd: Re: Mailing list members… S Moonesamy
- Re: [Mailman-Users] Fwd: Re: Mailing list members… willi uebelherr
- Re: yet more DMARC stuff, was Re: Mailing list me… willi uebelherr
- Re: yet more DMARC stuff, was Re: Mailing list me… Carsten Bormann
- Re: yet more DMARC stuff, was Re: Mailing list me… Dave Crocker
- Re: yet more DMARC stuff, was Re: Mailing list me… Carsten Bormann
- Re: yet more DMARC stuff, was Re: Mailing list me… John R Levine
- Re: yet more DMARC stuff, was Re: Mailing list me… Dave Crocker
- Re: yet more DMARC stuff, was Re: Mailing list me… Carsten Bormann
- Re: yet more DMARC stuff, was Re: Mailing list me… Viktor Dukhovni
- Re: yet more DMARC stuff, was Re: Mailing list me… Philip Homburg
- Re: yet more DMARC stuff, was Re: Mailing list me… Brandon Long
- Re: yet more DMARC stuff, was Re: Mailing list me… Philip Homburg
- Re: yet more DMARC stuff, was Re: Mailing list me… Martin Rex