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From: GUMBY@mit-mc.ARPA (David Vinayak Wallace)
Newsgroups: net.mail.headers
Subject: Mail looping
Message-ID: <1356@brl-smoke.ARPA>
Date: Thu, 27-Feb-86 00:06:30 EST
Article-I.D.: brl-smok.1356
Posted: Thu Feb 27 00:06:30 1986
Date-Received: Sun, 2-Mar-86 19:35:20 EST
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    Date: Tue, 25 Feb 86 21:41:33 pst
    From: netinfo%ucbjade at BERKELEY.EDU (Postmaster + BITINFO)

    The final conclusion was that "mailing list exploders" should generate
    a new message (ie. with a new Message-ID). (The "Errors-to" header was
    also disapproved if I remember rightly.)

    ...I suggest that each SUB-LIST exploder also replace
    the Message-ID with a new Message-ID. (ie. Mailing list exploders at any
    level should generate a new message.)

What if I accidentally get two compies of a message?  If they've come
through different forwarders there'll be no way for my mail reader do
detect this condition and delete excess copies.