Mail not delivered / not received timely

Mail not delivered / not received timely

Since I posted having this identical issue over 3 hours ago, and it is still 'awaiting moderator approval' I am creating a new post / thread.  HELP!  Our client would like to know when this will be resolved.  Issues started last week and continue - we are monitoring and yes, it is very very slow and sporadic on delivery.  PLEASE RESOLVE THIS ISSUE!