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  • From: Miles Fidelman <address@concealed>
  • To: "address@concealed" <address@concealed>
  • Subject: [sympa-users] DMARC update?
  • Date: Thu, 10 Apr 2014 23:21:21 -0400


It does not appear that simply stripping off DKIM related headers solves the problem with Yahoo originating mail, at least when sending to users on systems that look for DKIM signatures. Essentially such end systems - like Yahoo itself, gmail, hotmail, Comcast - lookup Yahoo's DKIM records (stored in DNS) which contain Yahoo's DKIM policy - which is "reject anything without a properly validated DKIM signature. So... something that has a From: <user>, routed through Sympa, WILL bounce from such systems.

I notice that the mailman development team, and a few other list package development teams, are rapidly coming up with patches to address the issue (note of the solutions are ideal, but they work). Can any of the Sympa team comment on whether the issue is being worked?

Miles Fidelman

In theory, there is no difference between theory and practice.
In practice, there is. .... Yogi Berra

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