On 4/4/16 3:14 AM, Jeremy Harris wrote:
> On 01/04/16 23:18, Viktor Dukhovni wrote:
>> On Fri, Apr 01, 2016 at 06:48:00PM -0300, Chris Newman wrote:
>>> I feel very strongly that policy for SMTP relay should be advertised by
>>> SMTP and protected by SMTP TLS.
>> Unfortunately, in MTA-to-MTA SMTP, the receiving SMTP server has
>> no idea what domain the sending SMTP client wants to deliver mail
>> to at the time that it advertises its ESMTP extensions in the EHLO
>> response.
> Why must it be done then?  Why not at RCPT TO time, via some suitable
> response?

It's not even possible at RCPT TO time, for example if the message is
being forwarded.

-Jim


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