acceptings partically a message (2)

  Hello,

  The Arnt's approach leads to evaluating DSN as spam, thus leaving  
them unread, a.k.a. useless.
  Does anybody see any disadvantages of ending the session

    EHLO server.example.com
    250 OK server.example.org
    MAIL FROM:<spammer(_at_)example(_dot_)com>
    250 OK
    RCPT TO:<spamtrap(_at_)example(_dot_)org>
    250 OK
    RCPT TO:<mailing-list(_at_)example(_dot_)org>
    250 OK
    DATA
    354 OK
    That is all.
    .

with
  550 Mail rejected by mailing-list(_at_)example(_dot_)org
which implies, that the mail was accepted by all but 
mailing-list(_at_)example(_dot_)org?

  How many evelopes I receive do have more than one recipient? Well,  
except the spam almost nothing. But imagine a mailing list that has  
1000 subcribers. 10 mails for sure will go for the same domain, so for  
that 10 subscribers giving a temporary error after the second RCPT  
would lead to huge delays (<=> grey listing).
  Със здраве,
    Дилян