You're welcome.

>Adding the 'fake' field for grouping does work. In fact, I was incorrect when I concluded that the Group Header can't span pages: it can and does so nicely when the data is grouped properly.
>
>In the end, the successful report definition looks like this: letterhead logo and date are in Title band, letter fields are in the Group Header, all CC information is in the Detail band, and the logo with the return address is in page footer.
>
>Thanks for your help!