Enterprise Outlook: SPF passes, DKIM fails, but _any_ other mail provider passes both!?

Copper Contributor

Hey, guys!


I'm the owner & operator of a server which is also used for sending e-mails.

While each & every other e-mail provider I know off succeeds in receiving mails, Enterprise Outlook customers fail to do so, moving mails from my server into their spam folders (or "Junk E-Mail" as Microsoft calls it) - which happens, because SPF validation succeeds, but DKIM fails.


However, all my relevant DNS records (SPF, DKIM & DMARC) are not only valid, but any other provider (GMail, Yahoo, etc.) report that valid state back to me everytime.

Additionally, online DKIM validators & even tools suites like mailhardener.com, report 100% conformity of my DNS records as well as my mail server's configuration with SPF, DKIM & DMARC configuration rules.


Now, while Microsoft sends out "DMARC Aggregate Report" mails, the mentioned feedback address, dmarcreportfeedback [-AT-] microsoft [-DOT-] com, neither accepts mails (always reports "550 5.4.1 Recipient address rejected: Access denied.") nor does feedback every get a reply.

Furthermore, the mentioned DMARC report from Microsoft fails to comply with yet another DMARC standard's request for providing a reason upon validation failure.


All I got was this XML, contained within the report's attached GZ archive:

<?xml version="1.0"?>
<feedback xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <org_name>Enterprise Outlook</org_name>
    <email>email address removed for privacy reasons</email>


Please, any help for resolving this issue would be greatly appreciated!

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