How to disable Content Organizer Processing job from sending email?

Question

I am using a Drop Off Library to route content. For some reason, the following email is being sent out to users:

Subject: <site-name> - Additional Information Required

Message: You recently submitted documents to <site-name>. Additional information is required to complete the submission. Follow the link below to enter the required information.

To see the list of documents that could not be routed: http://<site-name>/DropOffLibary

This email is not being sent from Site Settings > Content Organizer Settings > Rule Managers. Additionally, when the email is sent, it's not the case that the document was stuck or not checked in. The email is just sending regardless.

Here's an MSDN post that describes the same issue: http://social.msdn.microsoft.com/Forums/is/sharepoint2010general/thread/208e4f30-b00e-44d9-9f52-4635449b080a

Is there a way to disable this email? If not, is the only option to have the exchange folks prevent this email from being sent? Ideally, the email would not send at all and we could stop it on the SharePoint side.

Thanks in advance.