Here is a snippet I used to purge messages from the System Transactional dead-letter queue using PowerShell.
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[Reflection.Assembly]::LoadWithPartialName("System.Messaging") $msmq = [System.Messaging.MessageQueue] $queuetd = New-Object $msmq("FormatName:Direct=os:.\System$;DEADXACT"); $queuetd.Purge() |