From: Test User <testuser@example.com>
To: recipient@example.com
Subject: Testing Inline
Message-ID: <CAPgCCDEzLVJ-d1OCX_TjFgJU7ugtQrjFybPtAMmmYZzphxNFYg@mail.example.com>
X-Mailer: Claws Mail 4.1.1 (GTK 3.24.34; x86_64-pc-linux-gnu)
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="MP_/pqqQE0ldE7RYQcFW3Kd0aQV"

--MP_/pqqQE0ldE7RYQcFW3Kd0aQV
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

This is a test of inline

--MP_/pqqQE0ldE7RYQcFW3Kd0aQV
Content-Type: text/plain
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename=t.txt

test

--MP_/pqqQE0ldE7RYQcFW3Kd0aQV--