Hey again @auth0-name-here!
It seems like we’ve debugged it with the team. So, we just checked and the email delivery for those kinds of emails appears to be functional. There exists some cases for which we might drop emails:
- Our email provider gets blacklisted: in that case a small percentage of our outgoing emails might be rejected for a short period of time. Retrying is the best course of action for now.
- The email recipient is rejected for some reason: for example if the recipient address bounced repeatedly.
By doing a search for the test-account@ recipient, we were able to trace it back the other email of yours. We just checked logs from our email provider and we can see that emails for that recipient are rejected because the email address has a history of bouncing. The mail server responded with the error: “550 Unknown user”. After a few attempts, our provider started permanently rejecting that recipient on June 26th.
We’ve manually removed this rejection rule to re-enable this recipient going forward. You need to ensure that the mail recipient is valid and that your mail server will accept emails with that recipient. Otherwise, the address will fall back onto the rejection list again after a few attempts