It really is unbelievable. 

this was what I was told yday - but they have been 'fixing' since Feb. think they need some new engineers closely followed by a customer service review !

Current status:

Emails are being successfully sent from QuickBooks, but are being blocked by the customer's provider or by an external server.

We're currently implementing measures to fix this issue. Please know that this is a high priority for us and will continue to be a focus and priority until fully resolved.

Our team is aware of the matter and is in the process of implementing a fix that will solve this issue.