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Re: user-visible goals




- Some users want to check if message would be delivered, such as if email
address exists at all and if they want to accept such message even before
attepting to send the message


bounces are a whole area to be deciphered. Return receipts are a potential privacy concern --- there should be a mechanism to request one, but the receiver should have final say on whether it's returned or not.

And it sounds like it would be spammers heaven to test email addresses before sending.
That is why most of us turn off SMTP's VRFY and EXPN.


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