On 17.10.2024 at 19:43 L. Mark Stone via mailop <[email protected]> wrote:
> Back in May at the InboxExpo conference in Atlanta, I was told by a
> consultant to very large senders that they advise customers to set their
> DMARC to "p=quarantine" because they had been observing that Microsoft's
> processing of some emails was causing DKIM failures - in as much as 30% of
> their customers' email campaigns traffic.
> We didn't discuss the technical details (other than Microsoft's processing
> altered the emails in such a way as to cause the DKIM fails), but thought
> that might be helpful to share (possibly related?) as regards the OP's issue
> with Mimecast, with whom we had numerous difficulties, and whose Partnership
> we elected not to renew a while back.
I cannot confirm 30%, but when I grep Microsoft DMARC reports for temperror,
there are hundreds of hits. Nevertheless I don't see why you should change your
policy because one recipients is unable to reliably operate a DNS client.
Two records from the same DMARC report from the same day:
<record>
<row>
<source_ip>194.127.216.50</source_ip>
<count>34</count>
<policy_evaluated>
<disposition>none</disposition>
<dkim>pass</dkim>
<spf>pass</spf>
</policy_evaluated>
</row>
<identifiers>
<envelope_to>hotmail.com</envelope_to>
<envelope_from>dm-jobs.com</envelope_from>
<header_from>dm-jobs.com</header_from>
</identifiers>
<auth_results>
<dkim>
<domain>dm-jobs.com</domain>
<selector>dmglobal4</selector>
<result>pass</result>
</dkim>
<spf>
<domain>dm-jobs.com</domain>
<scope>mfrom</scope>
<result>pass</result>
</spf>
</auth_results>
</record>
<record>
<row>
<source_ip>194.127.216.50</source_ip>
<count>5</count>
<policy_evaluated>
<disposition>none</disposition>
<dkim>fail</dkim>
<spf>pass</spf>
</policy_evaluated>
</row>
<identifiers>
<envelope_to>hotmail.com</envelope_to>
<envelope_from>dm-jobs.com</envelope_from>
<header_from>dm-jobs.com</header_from>
</identifiers>
<auth_results>
<dkim>
<domain>dm-jobs.com</domain>
<selector>dmglobal4</selector>
<result>temperror</result>
</dkim>
<spf>
<domain>dm-jobs.com</domain>
<scope>mfrom</scope>
<result>pass</result>
</spf>
</auth_results>
</record>
--
BR Oliver
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