1 files changed, 14 insertions, 9 deletions
diff --git a/src/Monolog/Handler/NativeMailerHandler.php b/src/Monolog/Handler/NativeMailerHandler.php
index d7807fd..b597761 100644
--- a/src/Monolog/Handler/NativeMailerHandler.php
+++ b/src/Monolog/Handler/NativeMailerHandler.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 /*
  * This file is part of the Monolog package.
@@ -38,13 +38,13 @@ class NativeMailerHandler extends MailHandler
      * Optional headers for the message
      * @var array
      */
-    protected $headers = array();
+    protected $headers = [];
 
     /**
      * Optional parameters for the message
      * @var array
      */
-    protected $parameters = array();
+    protected $parameters = [];
 
     /**
      * The wordwrap length for the message
@@ -56,7 +56,7 @@ class NativeMailerHandler extends MailHandler
      * The Content-type for the message
      * @var string
      */
-    protected $contentType = 'text/plain';
+    protected $contentType;
 
     /**
      * The encoding for the message
@@ -75,7 +75,7 @@ class NativeMailerHandler extends MailHandler
     public function __construct($to, $subject, $from, $level = Logger::ERROR, $bubble = true, $maxColumnWidth = 70)
     {
         parent::__construct($level, $bubble);
-        $this->to = is_array($to) ? $to : array($to);
+        $this->to = (array) $to;
         $this->subject = $subject;
         $this->addHeader(sprintf('From: %s', $from));
         $this->maxColumnWidth = $maxColumnWidth;
@@ -115,12 +115,17 @@ class NativeMailerHandler extends MailHandler
     /**
      * {@inheritdoc}
      */
-    protected function send($content, array $records)
+    protected function send(string $content, array $records)
     {
-        $content = wordwrap($content, $this->maxColumnWidth);
+        $contentType = $this->getContentType() ?: ($this->isHtmlBody($content) ? 'text/html' : 'text/plain');
+
+        if ($contentType !== 'text/html') {
+            $content = wordwrap($content, $this->maxColumnWidth);
+        }
+
         $headers = ltrim(implode("\r\n", $this->headers) . "\r\n", "\r\n");
-        $headers .= 'Content-type: ' . $this->getContentType() . '; charset=' . $this->getEncoding() . "\r\n";
-        if ($this->getContentType() == 'text/html' && false === strpos($headers, 'MIME-Version:')) {
+        $headers .= 'Content-type: ' . $contentType . '; charset=' . $this->getEncoding() . "\r\n";
+        if ($contentType === 'text/html' && false === strpos($headers, 'MIME-Version:')) {
             $headers .= 'MIME-Version: 1.0' . "\r\n";
         }