Hello,
Over the last few days we have been experiencing long delays in receiving emails - particularly in the afternoon. We will have long periods of time where no email comes in and then much later, sometimes in the evening, we will get a raft of email that had been sent during the day.
In addition, we had one user yesterday report that her contacts who were sending email were getting bounce-back emails saying that her email was incorrect. And yet., later email messages would go through just fine.