Seth pointed out that my emails have been long and contained many points, so I'd like to keep this really simple. I will propose two sets of headers on the same message, and I ask if anybody can find a case where the set with AS headers provides some information which is not present in the set without. Assume you are a receiver at site5.com who just received this message on your MX and are validating it. Set 1:
AS: i=3; cv=pass; d=site4.com AMS: i=3; d=site4.com AAR: i=3; arc=pass (spf=fail spfdomain=site1.com dmarc=fail fromdomain=site1.com)AS; i=2; cv=pass; d=site3.com AMS: i=2; d=site3.com AAR i=2; arc=pass (spf=fail spfdomain=site1.com dmarc=pass fromdomain=site1.com)AS; i=1; cv=none; d=site2.com AMS: i=1; d=site2.com AAR i=1; arc=none (spf=pass spfdomain=site1.com dmarc=pass fromdomain=site1.com)DKIM-Signature: d=site1.com From: <[email protected]> Set 2: AMS: i=3; d=site4.com; h=aar:aar:aar:to:from:etc AAR: i=3; arc=pass (arcdomain=site3.com spf=fail spfdomain=site1.com dmarc=fail fromdomain=site1.com)AMS: i=2; d=site3.com; h=aar:aar:to:from:etc AAR: i=2; arc=pass (arcdomain=site2.com spf=fail spfdomain=site1.com dmarc=pass fromdomain=site1.com)AAR: i=1; arc=none (spf=pass spfdomain=site1.com dmarc=pass fromdomain=site1.com)DKIM-Signature: d=site1.com From: <[email protected]> In each case the AMS with i=2 and the AMS with i=3 are valid. I would love to see a case where Set 1 gives information that Set 2 doesn't, because that would prove that my understanding was incorrect. Regards, Bron. -- Bron Gondwana, CEO, FastMail Pty Ltd [email protected]
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