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From: Wietse Venema (wietseporcupine.org)
Date: Mon Jun 04 2001 - 16:54:34 CDT

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    Jim Seymour:
    > Hi All,
    >
    > I'm told this is a "spammer trick." What I'm wondering is: is it? For
    > example, the log shows:
    >
    > Jun 4 14:12:59 jimsun postfix/smtpd[24300]: reject: RCPT from
    > unknown[63.100.231.36]: 450 Client host rejected: cannot
    > find your hostname, [63.100.231.36]; from=<open2winOPTHOST.COM>
    > to=<ebLINXNET.COM>
    >
    > and the next thing you know, the same email tries to sneak in via a
    > backup MX. (Thank God [and Wietse] for header_checks :-).)
    >
    > I thought backup MX' were supposed to be used only when the primary MX
    > was down?

    Oh, some MTAs try to ram mail down the throat of every MX host
    until they find one that accepts it. Postfix stops at the first
    host that takes RCPT TO, but that is likely to change in order to
    make the fallback relay feature work.

            Wietse

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