[Exim] LDAP verify during SMTP dialogue

Hi all,

i'm using exim 3.35 with director configuration to chech my Domino
users:

local_not_exist:
        condition = "${if or {\
        {!eq {${lookup ldap
{ldap:///c=IT?mail?sub?(&(shortname=$local_part))} {$local_part}}}{}}\
        {!eq {${lookup ldap
{ldap:///c=IT?mail?sub?(&(mail=$local_part@$domain))}
{$local_part@$domain}}}{}}\
        }{0}{1}}"
  driver = smartuser
  transport = rcpt_not_found_autoreply

I'm going to upgrade to 4.24... can i do this test during SMTP dialogue?

Thanks

Riccardo