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I would like to resctict postfix/centos to allow only local recipients sent mails either internally or Externally and not allowing gmail/hotmail or any other mails account that is not on my local accounts to sent mails

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It is unclear to me if you want to restrict local accounts from using web based mailers or if you 'just' want to restrict any emails originating on this system to have local email addresses as sender. –  Anthon May 27 '13 at 7:36
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