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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