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How can I configure Postfix to silently drop/discard/reject mails that were sent from specific users to an external address? It should work only for specific users

E.g:

  1. abc@localdomain can send mail to only @localdomain users.
  2. abc@localdomain can only receive from @localdomain users.
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you should use address rewriting : http://www.postfix.org/ADDRESS_REWRITING_README.html

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  • In Over organization we have 2 domain with single database. e.g localdomain1 and localdomain2 . we want to restrict some specific users which is on localdomain2(users@localdomain2) to send and receive mail form localdomain1 . it means localdomain2 users can send and receive mail within localdomain2 only. – Daya Sep 26 '13 at 10:55

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