Exchange Queue

Let's say that you have a loop because someone setup an INBOX RULE to forward to an outside domain that is having problems.

How do you clear the queue of 1M messages that show as a result?

To clear the incoming messages that have arrived in the inbox:

Get-Mailbox account.name | Search-Mailbox -SearchQuery {from:This email address is being protected from spambots. You need JavaScript enabled to view it.} -DeleteContent

To clear the messages in the queue for the recipient:

Get-ExchangeServer |?{$_.IsHubTransportServer -eq $true} |Get-Queue |get-message -ResultSize unlimited |?{$_.recipient -eq This email address is being protected from spambots. You need JavaScript enabled to view it.'} |Remove-Message -WithNDR $False -Confirm $False

To clear the messages in the queue for the postmaster <>:

Get-ExchangeServer |?{$_.IsHubTransportServer -eq $true} |Get-Queue |get-message -ResultSize unlimited |?{$_.sender -eq '<>'} |Remove-Message -WithNDR $False -Confirm $False