After deploying Exchange 2013 CU1 i always find objects like this in Queue Viewer:

Subject: Undeliverable: Inbound proxy probe

Internet Message ID: <20f7e8de-66e1-4ec3-8e9c-d85bd0250577@MBX.xxx.local>

From Address: <>

Status: Ready

Size (KB): 8

Message Source Name: DSN

Source IP: 255.255.255.255

SCL: -1

Date Received: 7/4/2013 3:54:41 PM

Expiration Time: 7/6/2013 3:54:41 PM

Last Error:

Queue ID: MBX\6

Recipients:  inboundproxy@inboundproxy.com;2;2;[{LRT=};{LED=};{FQDN=};{IP=}];0;CN=xxx.com,CN=Connections,CN=Exchange Routing Group (DWBGZMFD01QNBJR),CN=Routing Groups,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=xxx,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=xxx,DC=local

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Why those objects stuck in queue?