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From: Aleksey Perov (algardosura.ru)
Date: Fri Mar 22 2002 - 06:30:54 CST

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    On Fri, 22 Mar 2002 12:30:45 +0100, Ralf Hildebrandt <Ralf.Hildebrandtcharite.de> wrote:

    > reject_unknown_hostname
    >
    > Reject the request when the hostname in the client HELO (EHLO) command
    > has no DNS A or MX record. The unknown_hostname_reject_code specifies
    > the response code to rejected requests (default: 450).
    >
    > and this ONLY in the context of smtpd_helo_restrictions!

    Yes, but this doesn't verify that the hostname in the client HELO/EHLO
    command actually corresponds client's IP address. I can specify anyone's
    known and valid hostname, and postfix will accept my mail. This is
    what this thread is about. 

    -- 
Aleksey A. Perov
Postmaster
ALP215-RIPE
JSC Svyazinform, Penza, Russia
e-mail: algardosura.ru
phone: +7 8412 520215
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