Incoming SMTP in the year 2017 and absence of DKIM

Brian Kantor Brian at
Wed Nov 29 18:35:35 UTC 2017

As I see it, the problem isn't with DKIM, it's with the
implementation of DMARC and other such filters.  Almost all
of them TEST THE WRONG FROM ADDRESS.  They compare the Author's
address (the header From: line) instead of the Sender's address,
(the SMTP Mail From: transaction or Sender: header line).

For personal mail, these are almost always the same, but for
properly-functioning mailing lists, the Author address is the
email address of the person submitting the posting to the mailing
list, and the Sender address is the error-return ("bounce") address
of the mailing list.

If the filter checked the Sender address of mail instead of the
Author address, mailing lists wouldn't be broken!
	- Brian

On Wed, Nov 29, 2017 at 10:12:05AM -0800, Michael Thomas wrote:
> I've been saying for years that it should be possible to create the concept
> of DKIM-friendly mailing lists. In such
> a case, you could have your nines. Until then, the best you can hope for is
> the list re-signing the mail and blaming
> the list owner instead.
> Mike

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