Delivery status : Failed. Message could not be delivered to domain .521
Hello, I was wondering if an expert could help me out?
One of my clients at example.com which i am hosting her exchange email.
Is experiencing bounce backs from certain clients of HERS.
When they email her they get a bounce back error of
"This is a delivery status notification, automatically generated by MTA mx02.testmail.ca on Regarding recipient(s) : firstname.lastname@example.org Delivery status : Failed. Message could not be delivered to domain .521; ***.***.***.*** does not accept mail MTA Response :521 The original message headers are included as attachment."
Any information would be greatly appreciated.
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