[qmailtoaster] smtproutes and RCPT to checking

[Andrew Hodgson]

Hi,

Does anyone know a way of getting Qmail to check the existence of a user 
(during the RCPT TO stage) on a remote mail server before accepting the message 
for delivery?  The remote mail server supports this facility.  We are looking 
to use Qmailtoaster as a spam gateway primarily.

Thanks.
Andrew.