diff --git a/lib/Cake/Network/Email/CakeEmail.php b/lib/Cake/Network/Email/CakeEmail.php
index 8951bd1b35a..06f3ca815d9 100644
--- a/lib/Cake/Network/Email/CakeEmail.php
+++ b/lib/Cake/Network/Email/CakeEmail.php
@@ -1567,7 +1567,7 @@ protected function _render($content) {
 			$msg[] = '';
 		}
 
-		if ($textBoundary !== $boundary) {
+		if ($textBoundary !== $relBoundary) {
 			$msg[] = '--' . $textBoundary . '--';
 			$msg[] = '';
 		}
diff --git a/lib/Cake/Test/Case/Network/Email/CakeEmailTest.php b/lib/Cake/Test/Case/Network/Email/CakeEmailTest.php
index 8e42acc75bb..d2293a40d0f 100644
--- a/lib/Cake/Test/Case/Network/Email/CakeEmailTest.php
+++ b/lib/Cake/Test/Case/Network/Email/CakeEmailTest.php
@@ -1167,6 +1167,48 @@ public function testSendWithInlineAttachments() {
 		$this->assertContains('--' . $boundary . '--', $result['message']);
 	}
 
+/**
+ * Test setting inline attachments and HTML only messages.
+ *
+ * @return void
+ */
+	public function testSendWithInlineAttachmentsHtmlOnly() {
+		$this->CakeEmail->transport('debug');
+		$this->CakeEmail->from('cake@cakephp.org');
+		$this->CakeEmail->to('cake@cakephp.org');
+		$this->CakeEmail->subject('My title');
+		$this->CakeEmail->emailFormat('html');
+		$this->CakeEmail->attachments(array(
+			'cake.png' => array(
+				'file' => CAKE . 'VERSION.txt',
+				'contentId' => 'abc123'
+			)
+		));
+		$result = $this->CakeEmail->send('Hello');
+
+		$boundary = $this->CakeEmail->getBoundary();
+		$this->assertContains('Content-Type: multipart/mixed; boundary="' . $boundary . '"', $result['headers']);
+		$expected = "--$boundary\r\n" .
+			"Content-Type: multipart/related; boundary=\"rel-$boundary\"\r\n" .
+			"\r\n" .
+			"--rel-$boundary\r\n" .
+			"Content-Type: text/html; charset=UTF-8\r\n" .
+			"Content-Transfer-Encoding: 8bit\r\n" .
+			"\r\n" .
+			"Hello" .
+			"\r\n" .
+			"\r\n" .
+			"\r\n" .
+			"--rel-$boundary\r\n" .
+			"Content-Type: application/octet-stream\r\n" .
+			"Content-Transfer-Encoding: base64\r\n" .
+			"Content-ID: <abc123>\r\n" .
+			"Content-Disposition: inline; filename=\"cake.png\"\r\n\r\n";
+		$this->assertContains($expected, $result['message']);
+		$this->assertContains('--rel-' . $boundary . '--', $result['message']);
+		$this->assertContains('--' . $boundary . '--', $result['message']);
+	}
+
 /**
  * Test disabling content-disposition.
  *