On 21/08/2019 17:42, David Taylor wrote:
You are not allowed to post to this mailing list From: a domain which publishes a DMARC policy of reject or quarantine,
blueyonder doesn't appear to publish any DMARC policy. Did you actually use a blueyonder address as the header From:? It is also possible that they tried one and it broke too many things.
They do seem to have a DKIM signature that includes the subject, so any mailing list that rewrites the subject will break the signature. Most mailing lists rewrite the subject, if it doesn't have the list tag in it.
I imagine the list software isn't doing a fully analysis of DMARC and DKIM to see if relayed mail will fail, but just looking for specific things in the DMARC policy to know whether a failure would be a problem for the list.
I'm assuming it is well behaved and rewrites the envelope from so that SPF will pass the mail. Otherwise it will be generating SPF failures, downstream.
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