Content-Type: multipart/mixed; boundary="===============0575628907158327116==" MIME-Version: 1.0 From: billing@example.com To: mcptest@local Subject: Ihre Rechnung Juni 2026 Date: Tue, 17 Jun 2026 10:00:00 +0200 --===============0575628907158327116== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 SW0gQW5oYW5nIGZpbmRlbiBTaWUgSWhyZSBSZWNobnVuZy4= --===============0575628907158327116== Content-Type: application/pdf MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="rechnung.pdf" JVBERi0xLjQKMSAwIG9iajw8Pj5lbmRvYmoKdHJhaWxlcjw8Pj4KJSVFT0YK --===============0575628907158327116==--