If you had a problem with a check you tried to depoist with your mobile check depoist feature, you'll receive an email from Intuit in the event of a check being rejected or returned.
If rejected, Intuit resubmits your check. In the event Intuit is still unable to process it, or if it's returned, you'll need to follow up with your checkwriter. You can also try cashing or depositing the check somewhere else.