From: Nguyen Van A <vana@example.com>
To: Tran Thi B <thib@example.com>
Subject: Test email - =?utf-8?b?dGjhu60gbmdoaeG7h20=?=
Date: Wed, 04 Nov 2026 09:30:00 +0000
Message-ID: <test-0001@example.com>
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="===============3741262835616198390=="

--===============3741262835616198390==
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 8bit

Xin chào,

Đây là email thử nghiệm.
Hello, this is a test message.

Trân trọng,
Nguyen Van A

--===============3741262835616198390==
Content-Type: text/plain
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="dinh_kem.txt"
MIME-Version: 1.0

buG7mWkgZHVuZyDEkcOtbmgga8OobQo=

--===============3741262835616198390==--