We saw the issue for a wide variety of hidden address domains. We use Mailgun to send emails so we were seeing Mailgun logs with things like this. I replaced the customer's real email username with "redactedForPrivacy".
"delivery-status": {
"code": 550,
"description": "This is a system-generated message to inform you that your email could not\r\nbe delivered to one or more recipients. Details of the email and the error are as follows:\r\n\r\n\r\n<[email protected]>: host 127.0.0.1[127.0.0.1] said: 550 5.7.1 message\r\n content rejected due to spam; if you feel that your email was rejected in\r\n error, please forward a copy to [email protected] (in reply to end of\r\n DATA command)\r\n",
"enhanced-code": "5.7.1",
"message": "smtp; 550 message content rejected due to spam; if you feel that your email was rejected in error, please forward a copy to [email protected]"
}
The "description" fields' contents were almost identical regardless of the hidden email address's mail host, but I don't know if that means anything.
It sounds like iCloud limits messages to 20 megabytes. You might have needed to be forwarding to a final destination with a smaller limit so that the rejection came from the final destination rather than from iCloud. We didn't test that until July 7.
It sounds like iCloud limits messages to 20 megabytes. You might have needed to be forwarding to a final destination with a smaller limit so that the rejection came from the final destination rather than from iCloud. We didn't test that until July 7.