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: 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

--Apple-Mail=_related_boundary Content-Type: text/markdown Content-Disposition: attachment; filename="example.md" Content-ID: Content-Transfer-Encoding: 7bit - Hello World --Apple-Mail=_related_boundary Content-Type: application/octet-stream Content-Disposition: attachment; filename="example.sh" Content-ID: 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: Content-Transfer-Encoding: 7bit print("Hello World") --Apple-Mail=_related_boundary-- --Apple-Mail=_alternative_boundary--