On Thu, Jan 06, 2011 at 11:16:25PM +0100, lst_ho...@kwsoft.de wrote: >> How was end-to-end DSN potentially (more) useful for you? In most cases >> once mail is accepted by an MX host, the next few delivery steps are >> reliable. If the mail does not then bounce, it is either delivered or >> quarantined. Sites that quarantine mail will not explicitly want to >> expose this behaviour to senders. Some may unwittingly expose the >> message destination to senders, but you should not rely on this... > > The only problem we are trying to "solve" are external sites which accept > the mail but don't deliver it to the user mailbox.
Indeed you can't reasonably expect this level of "transparency". I still think DSN is useful (as described), but one needs to adjust one's expectations to meet reality. -- Viktor.