I am sorry to contact this way but I can't find any contact form with Intuit and not being your customer I can't contact you from web site.

I am IT person and our accounting complain that they do not receiving invoices from our vendors sent from quickbooks. We check and there is a problem with A settingas and DMARC for your mail server. You sent emails from notification.intuit.com and that domain do not exist in Internet.