We're hosting e-mail for several customers. And many requested some form of reports.
I think it would be usefull if you can setup a per domain email report.
Enter the frequency, and the type of data (i.e. usage, blocked spam, etc) and it generates a PDF which is sent by mail directly to the customer. Like Google Analytics does.
I'd really like to see this feature added to your wonderfull service.
Right now we're working on restoring the reseller accounts option since we had several requests to bring it back. It will probably take several weeks to finish that, then we'll work on finishing up the automatic logs.
We're currently in a development freeze due to the move and not working on any changes at the moment. It won't be until after the facility move has completed that I'll be able to get back to the request list.