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This is very well done, but it incorrectly failed validation of multiple DKIM signatures.

It also failed DKIM signature validation for me on several accounts, but when I cross-checked vs. http://mail-tester.com it worked fine. I think there's a bug in https://www.learndmarc.com

Please share your email details with info@uriports.com and we'll have a look to see what is going wrong.

Same here. A test email to my google account indicates it passed DKIM.