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Re: [ietf-smtp] DSNs

2020-04-26 17:22:43
In article 
 you write:
Incoming mail is addressed to a valid mailbox. Your MTA accepts it. As such,  
the sender already knows it is a valid recipient.

I don't follow what information is getting leaked, if a second later a  
success DSN gets sent to the sender. The sender already knows it's a valid  
mailbox, by the virtue of the fact that the mail was accepted.

Not necessarily.  It might be forwarded, it might bounce later.

We can bikeshed forever about whether you send a success DSN if it's
delivered to a spam folder.


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