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"550-DKIM" NDR error when Office 365 users send mail to an external domain

PROBLEM
When Office 365 users try to send email messages to one or more external domains, they receive one or more nondelivery reports (NDRs) that contain one of the following error codes: 
550-DKIM: encountered the following problem validating
550 contoso.onmicrosoft.com: signature_incorrect
550-dkim:Bodyhash_mismatch
This issue may occur if the recipient domain doesn't comply with Domain Keys Identified Mail (DKIM) RFC 6376.
SOLUTION
Do one of the following:
MORE INFORMATION
For more information about DKIM RFC 6376, see http://www.rfc-editor.org/rfc/rfc6376.txt.

Still need help? Go to the Office 365 Community website.
Properties

Article ID: 3145666 - Last Review: 03/18/2016 19:19:00 - Revision: 2.0

Microsoft Exchange Online, Microsoft Exchange Online Protection

  • o365e o365m o365022013 o365 o365a eop KB3145666
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