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On Fri, 4/22/16, xxxxxx@shadowgard.com <xxxxxx@shadowgard.com> wrote:

 Subject: Re: [TML] Please stop breaking threads!
 To: xxxxxx@simplelists.com
 Date: Friday, April 22, 2016, 10:39 AM

 On 22 Apr 2016 at 16:04,
 Phil Pugliese (via tml list) wrote:

 >
 > IMO, the problem is something related to
 the problems/features that Leonard has posted about.

 Nope.

 It's yahoo or the list 's yahoo kludge
 breaking the rules for email
 headers.

 Here are the relevant lines
 from the message you replied to:

 From: Andrew Long <xxxxxx@mac.com>
 In-reply-to:
 <xxxxxx@mail.yahoo.com>
 Message-id: <xxxxxx@mac.com>
 References:
 <xxxxxx@mail.yahoo.com>
  <xxxxxx@mail.yahoo.com>

 Here are the relevant lines
 lines from your reply:

 Message-ID:
 <xxxxxx@mail.yahoo.com>
 Subject: Re: [TML] Please stop breaking
 threads!
 References:
 <xxxxxx@mail.yahoo.com>
 From: "Phil Pugliese (via tml list)"
 <xxxxxx@simplelists.com>

 Note the lack of an
 "In-reply-to" line in yours. and that his
 messages ID isn't in your references
 line.

 *That* is what's
 breaking the threading.

 I'm going to send a test message to a yahoo
 account I have and reply,
 and see what the
 headers look like. that'll show wherher it's the
 list's kludge or yahoo that's messing
 things up.

 Ok, I sent a
 message from gmail to yahoo. Headers as received at
 yahoo:
 From: xxxxxx@gmail.com
 To: xxxxxx@yahoo.com
 Date: Fri, 22 Apr 2016 10:25:00 -0700
 Subject: thread check
 Message-ID: <xxxxxx@shadow97218.gmail.com>

 Headers for
 the reply as received at gmail:
 Date: Fri,
 22 Apr 2016 17:31:57 +0000 (UTC)
 From:
 Leonard Erickson <xxxxxx@yahoo.com>
 Reply-To: Leonard Erickson <xxxxxx@yahoo.com>
 To: "xxxxxx@gmail.com"
 <xxxxxx@gmail.com>
 Message-ID:
 <xxxxxx@mail.yahoo.com>
 In-Reply-To: <xxxxxx@shadow97218.gmail.com>
 References: <xxxxxx@shadow97218.gmail.com>
 Subject: Re: thread check

 Ok, yahoo isn't breaking
 the references or in-reply-to.

 I'll subscribe my yahoo and gmail addresses
 to the list and see what
 the headers show
 about this and about the DMARC/DKIM issue.

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I misunderstood. I thought "It's yahoo or the list 's yahoo kludge breaking the rules for email  headers" was "something related  to the problems/features that Leonard has posted about".

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