Email notifications stopped working

I did put in a support ticket when our users noticed the email problem last Saturday.  We have mission critical processes that run 24/7 and we rely heavily on QB for our communications.  Submitting a supporting ticket was more of a formality and CYA I guessed since there is no weekend support from QB and no one was monitoring QB technical problems.  We had to resort to find QB CTO in LinkedIn to escalate the problem.