I am having an issue with bounced emails and my customers not receiving them.  I have spent approximately 10 hours on the phone with QB to have them tell me it is an issue with the recipient's internet provider.  I spent 4 hours on the phone with that company (Comcast) and they are telling me it is not them, it is QBO.  I now have another customer with a different internet provider and their email is now bouncing back.  My IT company is telling me it is QB.  All signs point to QB and everything I Google points to QB.  I can't even get them to tell me the IP addresses to add to my server.

Can anyone help????