> My client want this. Let's say - it just some company standards.
> if he insists - I would recommend them to use another MTA, for
> example exim
If they want it now, then use an MTA that implements it now.
This is the first request for client information inside smtpd_banner
text, so don't expect that it gets immediate priority.
If someone wants this then they could build on existing code that
implements smtpd_reject_footer, and that expands $client_address,
$client_port, $localtime, and $servername.
Wietse