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Received: from sonic.gate.mail.ne1.yahoo.com by sonic303.consmr.mail.ne1.yahoo.com with HTTP; Fri, 11 Jun 2021 13:59:55 +0000
Date: Fri, 11 Jun 2021 13:59:55 +0000
From: MAILER-DAEMON@yahoo.com
To: user_name@yahoo.com
Message-ID:
 <278929949.490718.1623419995815@sonic303.consmr.mail.ne1.yahoo.com>
Subject: Failure Notice
Content-Type: multipart/report; report-type=delivery-status;
 boundary="-=Part.77cde.7cbe8eccd6310fd8.179fb5f46a7.49c125a19f0a1035=-"
Content-Length: 5236

---=Part.77cde.7cbe8eccd6310fd8.179fb5f46a7.49c125a19f0a1035=-
Content-Type: text/plain; charset=UTF-8

Sorry, we were unable to deliver your message to the following address.

<bogus-address@example.net>:
550: 5.1.1 <bogus-address@example.net>: Recipient address rejected: User unknown in local recipient table

---------- Forwarded message ----------

---=Part.77cde.7cbe8eccd6310fd8.179fb5f46a7.49c125a19f0a1035=-
Content-Type: message/rfc822

X-Sonic-MF: <user_name@yahoo.com>
Received: from sonic.gate.mail.ne1.yahoo.com by sonic303.consmr.mail.ne1.yahoo.com with HTTP; Fri, 11 Jun 2021 13:59:55 +0000
Received: by kubenode558.mail-prod1.omega.gq1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 007ece6be172ed81332d038abbd95120;
          Fri, 11 Jun 2021 13:57:53 +0000 (UTC)
To: bogus-address@example.net
From: Some User <user_name@yahoo.com>
Subject: bounce me
Message-ID: <130907fb-848c-d154-8e59-ed1e08319fcf@yahoo.com>
Date: Fri, 11 Jun 2021 06:57:50 -0700
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0)
 Gecko/20100101 Thunderbird/78.11.0
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 7bit
References: <130907fb-848c-d154-8e59-ed1e08319fcf.ref@yahoo.com>
X-Mailer: WebService/1.1.18368 mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.yahoo
Content-Length: 163

this should bounce.

This is somewhat bogus and contrived to test the separator.
-- 
<user_name@yahoo.com>:   My sig

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