Important Pre-purchase Information Lacking

I watched the video and read every page I could find regarding PowerMessenger but could not find detailed information on the following:

1. How does the opt-in process work (besides filling in a subscription form and clicking submit)? Is there a validation/confirmation step?

2. What about opt-outs? how are they handled? Is there an opt-out link in the email? Is there a report?

3. What about bounced / undelivered mail? How are they tracked, processed and reported?

4. Is there a distinction between bad, undeliverable email and good addresses but full mailboxes? Is there automatic removal from the mailing list?

Having more detail will help me decide if this product will be useful.

Thanks.