This is insane.  I am on a separate thread for the UK quickbooks online community that is all about this problem:   https://quickbooks.intuit.com/learn-support/en-uk/transactions/re-bounced-emails-and-delivery-issue-...

There has been a team of programmers working on a fix for months.  Yet, the US community forum seems not to be acknowledging the problem or discussing the ongoing (unsuccessful, apparently) efforts to fix it.   It clearly is a problem we are having here in the US too.  Why is there no centralized way to communicate about these problems.