"As of the moment, there's an ongoing investigation into whether users are experiencing bounced emails when sending invoices. Rest assured, our engineering team is working on a fix. "

1. If they are working on a fix then your investigation must be complete and you know that users are experiencing bounced emails?

2. This has now been happening for 1 year - I was put on the affected users last February (2022).

I now use gmail which avoids the issue, but that won't be a solution everyone can go with.