Daniel Ry?link:
> Hello
> 
> What are the valid values for this configuration option?
> 
> I tried to set it as "PERMIT", and the server failed to stard saying 
> it's "Bad configuration". 

RTFM?
http://www.postfix.org/postconf.5.html#unverified_recipient_reject_code
http://www.postfix.org/postconf.5.html#reject_unverified_recipient

> My aim is to set the server so that it defers mail for recipients
> that fail permanently during the recipient address verification
> (for example, the target mailserver answers that the user does not
> exist. I don't want to accept mail for a non-existent user). On
> the other hand, I want to accept mail for recipients that fail
> temporarily (for example, greylisting or full mailbox), because
> some of me users use this servers as smarthost and I want the
> server to try several times on their behalf instead of rejecting
> the mail immediately.

Use reject_unverified_recipient only for addresses in domains that
you control, not everything out there on the internets.

smtpd_recipient_restrictions =
    ...stuff...
    reject_unauth_destination
    ..stuff...
    reject_unverified_recipeint
    ..stuff...

        Wietse

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