I am trying to figure out if it is possible to turn on Delivery Status Notifications in the ESMTP options of GWIA without sending DSN's for successfully delivered mails, but only for undeliverable mails.

The above mentioned behaviour is needed to notify external senders of mails that exceed the maxmimum message size. However, I don't want our groupwise system to give out too much information to i.e. exchange servers when their outlook users request messsage receipts.

Any ideas?