I worked aound this recently but don't have access to the server to confirm the exact details. What I remember doing was:
1. Create an AD group, for example "QVMail-myreport".
2. Assign an email address to the group, "QvMailemail@example.com"
3. On the company.com mailserver, I created a group named "QVMail-myreport" that contained the external email addresses.
Hope this helps.