Re: yet more DMARC stuff, was Re: Mailing list membership.

Carsten Bormann <cabo@tzi.org> Mon, 13 March 2017 17:03 UTC

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Subject: Re: yet more DMARC stuff, was Re: Mailing list membership.
From: Carsten Bormann <cabo@tzi.org>
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Date: Mon, 13 Mar 2017 18:03:32 +0100
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To: John Levine <johnl@taugh.com>
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More SPF/DKIM fun.

Just got:

  ----- The following addresses had permanent fatal errors ——
<REDACTED@nist.gov>
   (reason: 450 4.7.26 Service does not accept messages sent over IPv6 [2001:638:708:30c9::12] unless they pass either SPF or DKIM validation (message not signed))

Whiskey Tango Foxtrot.

So they give their mail server an IPv6 address but then don’t accept certain messages on that that they would happily accept over IPv4.

Grüße, Carsten