I can imagine the hurdle you've been through dealing with this invoice delivery issue, itsbotime.
Let me make it up to you by ensuring you'll be added as one of the affected users.
As of now, the investigation about bounced emails is still ongoing. We don't have a specific timeframe on when this gets resolved. I'd recommend contacting our QuickBooks Support Team so you'll receive updates.
I'd also suggest following the workaround shared by Rea_M to send invoices.
To ensure all the necessary information is added to your invoices, I encourage checking out this article: Customize Sales Forms.
We appreciate your patience on this matter. Please know that we're determined to get this resolved.
