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How do I find what network entity is sending mail (and spam)?

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Last Modified: 2014-05-12
An exchange server is full of queues and messages that shouldn't be there. It is not an open relay, but it does (blindly) accept requests from the private LAN because we have multiple automated processes that send email alarms.

I think someone has an infected laptop that is coming in and out of the building or has spyware somewhere.

When I look at a message in the queue, I get this:
Identity: Exchange\111871\357777
Subject: Undeliverable: The Best Treatment for Trigger Points
Internet Message ID: <3539d00d-7fa6-448d-96c7-3945dcd0244e@[ourdomain].com>
From Address: <>
Status: Ready
Size (KB): 10
Message Source Name: DSN
Source IP: 255.255.255.255
SCL: -1
Date Received: 3/13/2014 1:47:28 AM
Expiration Time: 3/15/2014 1:47:28 AM
Last Error: 400 4.4.7 Message delayed
Queue ID: Exchange\111871
Recipients:  bounce@newsletters.imatrix.com;2;2;400 4.4.7 Message delayed;0;CN=Internet,CN=Connections,CN=Exchange Routing Group (DWBGZMFD01QNBJR),CN=Routing Groups,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=First Organization,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=[OURDC],DC=local

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Is there any way I can track this down? The messages that are in the queue are delayed, but I am worried some are actually getting out and spamming the world.
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