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Subject: Apple Mail referenced related attachments
From: sender@example.invalid
To: recipient@example.invalid
Date: Mon, 01 Jun 2026 00:00:00 +0000
Message-ID: <apple-mail-related-attachments@example.invalid>
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="Apple-Mail=_alternative_boundary"
--Apple-Mail=_alternative_boundary
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
--Apple-Mail=_alternative_boundary
Content-Type: multipart/related;
boundary="Apple-Mail=_related_boundary"
--Apple-Mail=_related_boundary
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit
<html><body>
<object type="application/x-apple-msg-attachment" data="cid:example-md"></object>
<object type="application/x-apple-msg-attachment" data="cid:example-sh"></object>
<object type="application/x-apple-msg-attachment" data="cid:example-py"></object>
</body></html>
--Apple-Mail=_related_boundary
Content-Type: text/markdown
Content-Disposition: attachment; filename="example.md"
Content-ID: <example-md>
Content-Transfer-Encoding: 7bit
- Hello World
--Apple-Mail=_related_boundary
Content-Type: application/octet-stream
Content-Disposition: attachment; filename="example.sh"
Content-ID: <example-sh>
Content-Transfer-Encoding: 7bit
#!/bin/sh
echo "Hello World"
--Apple-Mail=_related_boundary
Content-Type: text/x-python-script
Content-Disposition: attachment; filename="example.py"
Content-ID: <example-py>
Content-Transfer-Encoding: 7bit
print("Hello World")
--Apple-Mail=_related_boundary--
--Apple-Mail=_alternative_boundary--