Hello,
There is an issue in email delivery just for a single mailbox. No other users have no issues.
Server Version 15.1.2176.2
Remote Server returned '554 5.2.0 STOREDRV.Deliver.Exception:ObjectNotFoundException.MapiExceptionNotFound; Failed to process message due to a permanent exception with message The process failed to get the correct properties. 16.55847:C2040000, 17.43559:000000002E010000000000000000000000000000, 20.52176:010F80880C004010F1030000, 20.50032:010F80887C17103100000000, 0.35180:00000000, 255.23226:00000000, 255.27962:02000000, 255.17082:0F010480, 0.21857:14000000, 4.21921:0F010480, 255.27962:FA000000, 255.1494:80030400, 0.44680:02010480, 8.45434:A0B9EB62FB98A74AAD57F4FD738493EC05000780, 5.10786:0000000031352E30312E323137362E3031323A707368657863686463316D626F78313A32303831663632332D313832302D346364332D396538372D6361666431626138363538650005000780, 255.1750:05000780, 255.27962:06000000, 255.17082:B9040000, 0.24929:2C000000, 4.21921:B9040000, 255.27962:A1000000, 255.17082:B9040000, 0.27745:0F010480, 4.21921:B9040000, 255.27962:07000000, 0.26881:2B0A0000, 255.21817:B9040000, 0.20385:2B0A0000, 4.28577:0F010480, 0.32001:70000000, 4.29953:0F010480, 0.32768:2C000000, 4.33024:0F010480 [Stage: CreateMessage]'