DELIVERY

Provide a successful delivery report if possible, even if this is not the default for this protocol.

Ignored if delivery reports are not possible on this protocol. In some protocols, like XMPP, it is not conventional to request or send positive delivery notifications. Delivery failure reports SHOULD always be sent, but if this flag is present, the connection manager MAY also try harder to obtain failed delivery reports or allow them to be matched to outgoing messages.