Allow Requesting different Delivery Status Notifications per recipient

Java Mail API doesn't provide a way to request "different DSN(Delivery Status Notification)s per-recipient" as explained by RFC1891. There is SMTPMessage.setNotifyOptions(int options) but it applies to all recipients in the message.

Suggested workaround is sending multiple 'copies' of the message with a single recipient and desired DSN for that recipient. This is inconvenient because:
- Number of recipients and/or message size may be considerably high
- Sending multiple messages will create different instances (with different Message-IDs) that will be harder to track (mainly for administration purposes on server and client)

Requested enhancement is to allow specifying DSN for each recipient.

Please see:
https://forums.oracle.com/forums/thread.jspa?threadID=2493438&tstart=0
#### Affected Versions
1.4.5
#### Environment
All
All