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From: Alexander Kolesnikoff (ak_at_hvv.uku.com.ru)
Date: Wed Jul 10 2002 - 00:12:42 CDT

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    >
    > it would be useful to reject mail where the sender domain has an MX
    > record pointing to specified IP addresses/networks.
    >
    > e.g. something like:
    >
    > reject_mx_sender_hosts = 192.168, 10, 172.16, 127
    >

       I guess reverse check of "RCPT TO" field (callback) is better.
      In EXIM the feature is implemented and work fine.

      Alexander

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