E-Mail Message delivered repeatedly to Exchange 2010 User Mailbox

Our environment:
1 x Exchange 2010 Server SP3 w/ Update Rollup 6 (Hub Transport, Mailbox Svr, Client Access) (On Server 2012 Std)
1 x Edge Exchange 2010 Server (Edge) (Server 2012 Std)
1 x Database Server running Proprietary Software(Server 2012 / SQL Server 2012)
1 x IIS Server running web interface for that software(Server 2012)

Problem:
The application uses a "Send on Behalf" feature to send out messages to users, including calendar information and attachments to Exchange users mailboxes.  One of our users as of 7/17/2014, submitted through this application and it sent out an email to her using a Receive Connector with a size limit of 30MB.  So she started to receive the following error messages:
#554 5.2.0 STOREDRV.Deliver.Exception:MessageSubmissionExceededException.MapiExceptionMaxSubmissionExceeded; Failed to process message due to a permanent exception with message Cannot complete delivery-time processing.

I raised the acceptable size limit to 150MB so it would deliver, however, the message continues to be delivered over and over again.  It has an attachment each time of 85MB. I cant seem to get it to stop.

I have moved the users mailbox to a new database. I have moved the transaction logs to a new volume. Ran the ExMon to identify the user in question, and restarted the services and cleared the queues.  I am not sure what else I can do to resolve this issue and stop the message from continuously being redelivered.  Short of switching the Receive Connector back to 30Mb limits, but then she continuously gets NDR's, the logs grow exponentially as well.

Any ideas on this one, how to stop this message from continuously being delivered over and over again.

Thanks.
pwatts19666Asked:
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Gareth GudgerCommented:
however, the message continues to be delivered over and over again.  

Are you saying that the original message that was originally rejected keeps trying to resend? Sounds like this is the fault of the proprietary application. What mechanism is it using to send email? Is it using the IIS SMTP engine? Maybe try restarting the application servers SMTP engine. Or reboot the server entirely.
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pwatts19666Author Commented:
Turned out to be the IIS and Database servers. The vendor logged in and found the issue on their system.
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Gareth GudgerCommented:
Awesome!
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