I received a support request for my app Link Unshortener from an icloud.com email address. My first reply to the customer bounced. At first I suspected an issue with Apple’s Hide My Email feature, because I’ve encountered that before, and the first part of the customer’s email address appeared to be randomly generated. However, in the previous case the Diagnostic-Code from the Mail Delivery System said “user does not exist,” whereas in this case it said “Message rejected due to lo...
