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From: Michael Loftis (mikeactivemessage.com)
Date: Mon Jun 04 2001 - 16:18:58 CDT

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    No a backup MX can be used anytime the primary MX doesn't appear to be
    responding. Any MX listed *must* handle mail for the domain at any
    time, although proper implementations try in a preference order. (lower
    numbers being of higher preference)

    Jim Seymour wrote:
    >
    > 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?
    >
    > Regards,
    > Jim
    > --
    > Jim Seymour | PGP Public Key available at:
    > jseymourjimsun.LinxNet.com | http://www.uk.pgp.net/pgpnet/pks-commands.html
    > http://jimsun.LinxNet.com |
    >
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