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Title
Receiving NDR (Non-Delivery Reports) messages when sending email after successfully migrated -
Description
After user's mailbox was successfully migrated, when sending e-mails, users are receiving NDRs (Non-Delivery Reports) below:
User@domain.com
#554-5.2.1 mailbox disabled 554 5.2.1 STOREDRV.Deliver.Exception:AccountDisabledException.MapiExceptionMailboxDisabled; Failed to process message due to a permanent exception with message Cannot open mailbox /o=domain/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Configuration/cn=Servers/cn=Microsoft System Attendant. 16.55847:8B000000, 17.43559:0000000028010000000000000200000000000000, 255.23226:00000000, 255.27962:FE000000, 255.17082:6C090000, 0.26937:00000000, 4.21921:6C090000, 255.27962:FA000000, 255.1494:00000000, 255.26426:FE000000, 0.22086:0F010480, 0.25876:0F010480, 4.7588:0F010480, 0.25840:0F010480, 4.6564:0F010480, 0.22086:0F010480, 0.56333:0F010480, 4.6372:05000780, 0.24916:17010480, 4.6276:05000780, 0.51399:03009510, 4.2567:6C090000, 0.19452:0F010480, 4.2199:6C090000, 0.56415:17010480, 4.48223:6C090000, 4.17097:6C090000, 4.8620:6C090000, 255.1750:0F010480, 0.26849:0F010480, 255.21817:6C090000, 0.26297:0F010480, 4.16585:6C090000, 0.32441:0F010480, 4.1706:6C090000, 0.24761:00000000, 4.20665:6C090000, 0.25785:0F010480, 4.29881:6C090000 ##
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Cause
The caused is due to if you disable a user’s mailbox your Exchange environment and moves to the Disconnected Mailbox Container under Recipient Configuration in Exchange. -
Resolution
To resolved this issue, please run the following command from Exchange powershell cmdlet:
Clean-MailboxDatabase -Identity [-Confirm []] [-DomainController ] [-WhatIf []]
For more information, please visit the Microsoft Article on how to run the Clean-Database parameter.