On Fri, 14 Jan 2011, Nicholas Lee wrote:

> Is there a plugin that will check rcpt addresses against a back end smtp
> server?
I presume you intend to eventually deliver to the same smtp backend, via 
the smtp-forward plugin.

I've long argued that the smtp-forward plugin should hook into different 
phases of the transaction, and do the recipient validation directly 
against the backend:

http://www.nntp.perl.org/group/perl.qpsmtpd/2008/11/msg8288.html

> 
> Ideally via some sort of smtproutes lookup.
> 
> Nicholas
> 

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