How known?

Wed Dec 2 00:05:19 UTC 2009

On Dec 1, 2009, at 4:03 PM, Gary Kline wrote:
>> Most mail user agents have an option to enable "read receipts"; they use (or abuse) the DSN or MDN capabilities of the recipient's MTA or MUA.  They are not a reliable signal that a human has seen the mail, although they can be used to confirm it at least got to the recipient's mail server or were processed by their MUA.
> 
> 	What are DSN and MDN, please?

Delivery Status Notification, Message Disposition Notification

-- 
-Chuck