Just migrated a customer's email from Exchange 2003 to 2010. The customer is now complaining that they're not receiving bounce messages when they send to bad email addresses. Any thoughts as to how to fix this?
FYI, the 2003 server is still, temporarily, in the mix. But there are no accounts there anymore. It's basically just holding the connector roles.
Also note that from there, mail passes through a SonicWALL ESA3300.