On Thu, Jan 18, 2007 at 07:41:07AM -0500, Seth Hanford wrote: > 1) Does it make sense to have spamd discard malformed sender / recipient > addresses? In this case, there is no envelope sender address at all, > which I seem to recall violates an RFC
Null return paths are used for delivery failure notifications. Check section 6.1 of RFC 2821.
