Michael Shadle:
> In very hacky pseudocode:
> 
> if (SMTP client is not in production list) {
>   if (recipient is in whitelist table) {
>      allow delivery for that recipient (this might get tricky with
> multiple recipient messages!)
>   }
> }

Have a look at:

http://www.postfwd.org/
http://www.postfix.org/SMTPD_POLICY_README.html

        Wietse

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