I continue to get 'Delivery Issue' using QBO and the issue is now effecting more customers! These customers have not changed their email address and I have had no issue sending them invoices in the past. Their email system accepts email when I contact them outside of QBO, and I assume unlike the desktop version there are no email settings that I can adjust as the emails are sent using QB's own email server. Customer support does not appear to be interested and I refuse to waste more time on a pointless chat with a specialist that is going to tell me to have my clients create new email accounts. What would be the point as it doesn't appear to effect any particular email service? Gmail / Yahoo / Aol / private...