> } Addresses which attempt to subscribe to a list may be listed in the DMR if any
> } LISTSERV response to that address (e.g. confirmation of subscribe request)
> } bounces.
>
> Another possibility is that A is subscribed and has his mail forwarded
> to B, and the B address is bouncing.

Yet another possibility is that the address sent an "INFO listname"
command. This too is sent with a list-specific bounce address.

Francoise