Exchange server 2016 CU updated from CU17 to CU22 - since then no email in or our stuck in Queue

Job ID: 32527877

Budget: $200 – $400 CAD

Exchange server 2016 CU updated from CU17 to CU22 - since then no email in or our stuck in Queue , need someone good knowledge of Exchange server 2016 can fix issue quick as possible - this is an urgent , more detail can be provided upon request