> >LISTSERV includes support  for automatic deletion of  users whose account
> >has  expired  or whose  system  has  permanently disconnected.  When  the
> >delivery error  is generated by LMail  (any version), MX V3.2  or higher,
> >PMDF V4.2 or higher, or LSMTP(TM) , which all implement the same delivery
> >error format, <...>
>
> I didn't see an answer to this.  To paraphrase the question:  If I'd like
> to ask the vendor of a mail system that does not support this to adopt it,
> and refer them to the specs, what would I refer them to?
>
>                                                          -Kary

If you want the Internet Proposed Standard Delivery Status Notification
format, it's RFCs 1891-4.  If you want the L-Soft specific format, I don't
know.  I think you'll have better luck getting vendors to implement DSNs
than the L-Soft format.