> Because Gmail is sending a permanent failure, our mail servers will not automatically retry sending these messages (this is standard practice at all email ser

> Because Gmail is sending a permanent failure, our mail servers will not automatically retry sending these messages (this is standard practice at all email services for handling permanent failures). I fear that this will lead to many lost mails. In my experience, users are often confused by the technical "Mail delivery failed" mails and tend to ignore them or write them off as spam.