We have 2 companies sharing a single domain and using the same mail server (Exchange 2007) one of the companies have raised the fact that when people get a bounce back it shows the other company's domain (as the internal domain is based on that company), i have paseted it below.
The e-mail account does not exist at the organization this message was sent to. Check the e-mail address, or contact the recipient directly to find out the correct address.
<company1.local #5.1.1 smtp;550 5.1.1 RESOLVER.ADR.RecipNotFound; not found>
Is there a way i can change this behavior and change the domain to a generic domain name, if so is there any risk in doing this.