Hello,
In order to deny the use of certain lists from outside, I use :

smtpd_restriction_classes = insiders_only
insiders_only = check_sender_access hash:/etc/postfix/insiders, reject
smtpd_recipient_restrictions = check_recipient_access hash:/etc/postfix/protected_destinations

with /etc/postfix/protected_destinations :
[EMAIL PROTECTED] insiders_only
...

and /etc/postfix/insiders :
somedomaine.com OK
...
With This, a domain which is not is /etc/postfix/insiders can't write TO my protected list, But It can send with CC or CCI to these list !
How to restrict this ?
Thanks from france.
Christophe Dumonet.

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Christophe Dumonet
Centre de Ressources Informatiques
Institut Francais de Mecanique Avancee (IFMA)
Campus des Cezeaux
BP 265
63175 AUBIERE Cedex
Tel : +33 - 4.73.28.80.64
Fax : +33 - 4.73.28.81.00
Mail : [EMAIL PROTECTED]
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