when the logs show a "queued for delivery" without any further lines afterwards (DCID or bounce), then this always means the message is still waiting to be delivered. Most likely reason is that the recipient host is down, you can confirm that on the CLI by using tophosts and hoststatus for the domain in question, or on the GUI under Monitor->Delivery Status. In both cases, look for the host status to show "down", or a larger number of active recipients to indicate a problem on delivery. In your case the host in question would be "pe.ibm.com", so. i.e a
should reveal more details. It will also show you if the destination uses an smtp route to redirect to a different destination IP. In either way, host status "unknown" or "down" indicates delivery problems that you'd need to indicate further.
Also, with the mail now being three days old, it should probably bounce soon.
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