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Here is my weekly Postmark DMARC Digest. I currently have an allow-all DMARC policy. My last 4 weekly digests have all looked pretty similar as far as DKIM and SPF failures.

DMARC Report

I know that Mailchimp can't be SPF-aligned because of the way they configure their service, but it can be DKIM aligned.

As you can see Mailchimp fails DKIM Alignment about 4% of the time. I thought it should be good 99.9% of the time.

Is this normal?

Should I enable a quarantine or reject DMARC policy and lose 4% of my contacts?

Thanks in advance.

Daniel
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  • This seems more appropriate for a Mailchimp support ticket rather than here. – Synchro Jul 13 '21 at 07:43
  • Can you drill down into your reports? Usually, you can see a reason for failure and the used selector and domain in your DKIM signing. The issue could be related to a specific receiving party or intermittent DNS lookup failures on your end. – Reinto Jul 14 '21 at 08:48
  • By the way, Server Fault may be a better place to post this question. – Reinto Jul 14 '21 at 08:48
  • @Synchro Thank you all for your suggestions. I will open a ticket with MailChimp and see what they say. – Daniel Jul 14 '21 at 17:20
  • @Reinto, thanks. Sadly the report is a free service from Postmark and offers no details beyond what was shown in my screenshot. I will first see what MailChimp says then I might upgrade the Postmark service so I can see the details. – Daniel Jul 14 '21 at 17:23

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Per Mailchimp support:

This can really just boil down to the receiving server's e-mail settings -- stricter policies are going to filter out e-mails from major ESPs like Mailchimp and that can result in you seeing some unexpected results, like what we're seeing here.

Daniel
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