Reason: {0} Recipient address: {1} Their email administrator will need to fix this issue. Until the problem is resolved, ...

Reason: {0}
Recipient address: {1}
Their email administrator will need to fix this issue. Until the problem is resolved, try contacting the recipient another way. For instance, try sending the message to a different email address.

Filing a service request won't fix this issue because it's a problem with the recipient's email system.