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From: Wietse Venema (wietseporcupine.org)
Date: Thu Jan 04 2001 - 08:41:14 CST

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    "Pe?a, Botp":
    > 2. I notice that if I send a mail to userX128.1.100.101, mail will bounce w
    > a "mail loops back to myself" message. If I send a mail to

    You're not supposed to send mail to userbare.ip.network.address.
    That is not a valid email address.

    If you want to send to a host by its IP address, the correct syntax
    to use is:

            user[ip.network.address]

    Sending mail to userbare.ip.network.address just happens to work
    as an artefact of implementation.

    The artefact has to do with a workaround for "computer professionals"
    that list IP addresses on the right-hand side of an MX record,
    instead of listing a domain name as required by an RFC that was
    written 15+ years ago.

    However, I am not going to bend over backwards to make incorrect
    address syntax such as userbare.ip.network.address work everywhere
    all the time.

            Wietse