Return
-
Title
ODM Domain Rewrite: 550 5.7.509 Access denied NDR after users are rewritten -
Description
Users at source tenant unable to send emails to target tenant after Domain Rewrite enabled for Source Address rewritten. Error is NDR. 550 5.7.509 Access denied
-
Cause
Customer's domain has no DKIM enabled, which caused DMARC to fail
-
Resolution
The issue was traced to the 2 source domains DKIM not being enabled. MxToolbox analysis of the NDR header indicated DKIM=none. After DKIM was enabled, emails started to flow properly.