diff --git a/src/Monolog/Handler/NativeMailerHandler.php b/src/Monolog/Handler/NativeMailerHandler.php
index c68b1ddd..a5d1a977 100644
--- a/src/Monolog/Handler/NativeMailerHandler.php
+++ b/src/Monolog/Handler/NativeMailerHandler.php
@@ -128,7 +128,7 @@ class NativeMailerHandler extends MailHandler
 
         $parameters = implode(' ', $this->parameters);
         foreach ($this->to as $to) {
-            mail($to, $subject, $content, $headers, $parameters);
+            $this->mail($to, $subject, $content, $headers, $parameters);
         }
     }
 
@@ -170,4 +170,10 @@ class NativeMailerHandler extends MailHandler
 
         return $this;
     }
+
+
+    protected function mail(string $to, string $subject, string $content, string $headers, string $parameters): void
+    {
+        mail($to, $subject, $content, $headers, $parameters);
+    }
 }
diff --git a/tests/Monolog/Handler/NativeMailerHandlerTest.php b/tests/Monolog/Handler/NativeMailerHandlerTest.php
index 81c1c04b..03e288bc 100644
--- a/tests/Monolog/Handler/NativeMailerHandlerTest.php
+++ b/tests/Monolog/Handler/NativeMailerHandlerTest.php
@@ -26,6 +26,21 @@ class NativeMailerHandlerTest extends TestCase
         $GLOBALS['mail'] = [];
     }
 
+    protected function newNativeMailerHandler( ... $args ) : NativeMailerHandler
+    {
+        return new class( ... $args ) extends NativeMailerHandler {
+
+            public $mail = [];
+
+            protected function mail( string $to, string $subject, string $content,
+                                     string $headers, string $parameters ) : void
+            {
+                $this->mail[] = \func_get_args();
+            }
+
+        };
+    }
+
     public function testConstructorHeaderInjection()
     {
         $this->expectException(\InvalidArgumentException::class);
@@ -71,19 +86,19 @@ class NativeMailerHandlerTest extends TestCase
         $subject = 'dear victim';
         $from = 'receiver@example.org';
 
-        $mailer = new NativeMailerHandler($to, $subject, $from);
+        $mailer = $this->newNativeMailerHandler($to, $subject, $from);
         $mailer->setFormatter(new \Monolog\Formatter\LineFormatter);
         $mailer->handleBatch([]);
 
         // batch is empty, nothing sent
-        $this->assertEmpty($GLOBALS['mail']);
+        $this->assertEmpty($mailer->mail);
 
         // non-empty batch
         $mailer->handle($this->getRecord(Level::Error, "Foo\nBar\r\n\r\nBaz"));
-        $this->assertNotEmpty($GLOBALS['mail']);
-        $this->assertIsArray($GLOBALS['mail']);
-        $this->assertArrayHasKey('0', $GLOBALS['mail']);
-        $params = $GLOBALS['mail'][0];
+        $this->assertNotEmpty($mailer->mail);
+        $this->assertIsArray($mailer->mail);
+        $this->assertArrayHasKey('0', $mailer->mail);
+        $params = $mailer->mail[0];
         $this->assertCount(5, $params);
         $this->assertSame($to, $params[0]);
         $this->assertSame($subject, $params[1]);
@@ -94,13 +109,30 @@ class NativeMailerHandlerTest extends TestCase
 
     public function testMessageSubjectFormatting()
     {
-        $mailer = new NativeMailerHandler('to@example.org', 'Alert: %level_name% %message%', 'from@example.org');
+        $mailer = $this->newNativeMailerHandler('to@example.org', 'Alert: %level_name% %message%', 'from@example.org');
         $mailer->handle($this->getRecord(Level::Error, "Foo\nBar\r\n\r\nBaz"));
+        $this->assertNotEmpty($mailer->mail);
+        $this->assertIsArray($mailer->mail);
+        $this->assertArrayHasKey('0', $mailer->mail);
+        $params = $mailer->mail[0];
+        $this->assertCount(5, $params);
+        $this->assertSame('Alert: ERROR Foo Bar  Baz', $params[1]);
+    }
+
+    public function testMail()
+    {
+        $mailer = new NativeMailerHandler('to@example.org', 'subject', 'from@example.org' );
+        $mailer->addParameter( 'foo' );
+        $mailer->handle($this->getRecord(Level::Error, "FooBarBaz"));
         $this->assertNotEmpty($GLOBALS['mail']);
         $this->assertIsArray($GLOBALS['mail']);
         $this->assertArrayHasKey('0', $GLOBALS['mail']);
         $params = $GLOBALS['mail'][0];
         $this->assertCount(5, $params);
-        $this->assertSame('Alert: ERROR Foo Bar  Baz', $params[1]);
+        $this->assertSame('to@example.org', $params[0]);
+        $this->assertSame('subject', $params[1]);
+        $this->assertStringContainsString("FooBarBaz", $params[2]);
+        $this->assertStringContainsString( 'From: from@example.org', $params[3] );
+        $this->assertSame( 'foo', $params[4] );
     }
 }