If you must (not necessariy a god idea), your options are:

- Multiple Posifix instances on different IP addresses. Each instance
has its own main.cf and master.cf.

- Single Postfix instance with different smtpd configurations in
master.cf on different server IP addresses, using main.cf only for
common settings.

/etc/postfix.master.cf:
    # =================================================================
    # service     type  private unpriv  chroot  wakeup  maxproc command
    #                   (yes)   (yes)   (yes)   (never) (100)
    # =================================================================
    # SMTP service for internal clients)
    1.2.3.4:smtp  inet  n       -       n       -       -       smtpd
        -o { parameter = value }
        ...

    # SMTP service for xternal clients
    1.2.3.5:smtp  inet  n       -       n       -       -       smtpd
        -o { parameter = value }
        ...

This is manageable when the differences ar small.

        Wietse
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