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Postfix Documentation
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Filtering mail from outside users only

The easiest approach is to configure ONE Postfix instance with multiple SMTP server IP addresses in master.cf:

  • Two SMTP server IP addresses for mail from inside users only, with content filtering turned off.

    /etc/postfix.
    master.cf:
        # ==================================================================
        # service      type  private unpriv  chroot  wakeup  maxproc command
        #                    (yes)   (yes)   (yes)   (never) (100)
        # ==================================================================
        1.2.3.4:smtp   inet  n       -       n       -       -       smtpd
            -o 
    smtpd_client_restrictions=
    permit_mynetworks,reject
        127.0.0.1:smtp inet  n       -       n       -       -       smtpd
            -o 
    smtpd_client_restrictions=
    permit_mynetworks,reject
    
  • One SMTP server address for mail from outside users with content filtering turned on.

    /etc/postfix.
    master.cf:
        # =================================================================
        # service     type  private unpriv  chroot  wakeup  maxproc command
        #                   (yes)   (yes)   (yes)   (never) (100)
        # =================================================================
        1.2.3.5:smtp  inet  n       -       n       -       -       smtpd
            -o 
    content_filter=filter-service:filter-destination 
            -o 
    receive_override_options=
    no_address_mappings
    

After this, you can follow the same procedure as outlined in the "advanced" or "simple" content filtering examples above, except that you must not specify " content_filter" or " receive_override_options" in the main.cf file.

Postfix Documentation
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