Douglas Otis wrote:
To support this effort, the TBR Extension offers a low overhead
means to defer a formal obligation to deliver, while also avoiding
the exchange of undesired data.
You still haven't explained this: What's in it for the sender?
Why would an e-mail sender be interested in deferring the receiving SMTP
server's obligation to deliver? As an e-mail sender, I want the e-mail
out of my hair as soon as possible! I don't want to have to hang on to it!
And since ultimately the sender chooses whether or not to use TBR, you
have to explain...
What's in it for the sender?