Add mechanism for allowing sending messages with an empty body [via S…

…ourceForge](https://sourceforge.net/p/phpmailer/bugs/334/)

class.phpmailer.php

@@ -318,7 +318,13 @@ class PHPMailer {
    */
   public $SingleToArray = array();
 
- /**
+  /**
+   * Should we allow sending messages with empty body?
+   * @var bool
+   */
+  public $AllowEmpty = false;
+
+    /**
    * Provides the ability to change the generic line ending
    * NOTE: The default remains '\n'. We force CRLF where we KNOW
    *        it must be used via self::CRLF
@@ -789,8 +795,8 @@ public function PreSend() {
 
       $this->error_count = 0; // reset errors
       $this->SetMessageType();
-      //Refuse to send an empty message
-      if (empty($this->Body)) {
+      //Refuse to send an empty message unless we are specifically allowing it
+      if (!$this->AllowEmpty and empty($this->Body)) {
         throw new phpmailerException($this->Lang('empty_message'), self::STOP_CRITICAL);
       }
 

test/phpmailerTest.php

@@ -936,11 +936,25 @@ function test_MailSend()
         }
         $this->Mail->Body = 'Sending via mail()';
         $this->BuildBody();
-        $subject = $this->Mail->Subject;
 
-        $this->Mail->Subject = $subject . ': mail()';
+        $this->Mail->Subject = $this->Mail->Subject . ': mail()';
+        $this->Mail->IsMail();
+        $this->assertTrue($this->Mail->Send(), $this->Mail->ErrorInfo);
+    }
+
+    /**
+     * Test sending an empty body
+     */
+    function test_Empty_Body()
+    {
+        $this->BuildBody();
+        $this->Mail->Body = '';
+        $this->Mail->Subject = $this->Mail->Subject . ': Empty Body';
         $this->Mail->IsMail();
+        $this->Mail->AllowEmpty = true;
         $this->assertTrue($this->Mail->Send(), $this->Mail->ErrorInfo);
+        $this->Mail->AllowEmpty = false;
+        $this->assertFalse($this->Mail->Send(), $this->Mail->ErrorInfo);
     }
 
     /**