diff --git a/src/Email/SwiftMailer.php b/src/Email/SwiftMailer.php
index 6dee0fa..cca9b3c 100644
--- a/src/Email/SwiftMailer.php
+++ b/src/Email/SwiftMailer.php
@@ -8,11 +8,13 @@ class SwiftMailer implements MailerInterface
     
     protected $transport;
     
-    protected $from;
+    protected /*stringable*/ $from;
     
-    protected $to;
+    protected /*stringable|array*/ $to;
     
-    protected $cc;
+    protected /*stringable|array*/ $cc;
+    
+    protected /*stringable|array*/ $bcc;
     
     public function __construct(EmailConfiguration $configuration) {
         $this->emailConfiguration = $configuration;
@@ -28,6 +30,7 @@ class SwiftMailer implements MailerInterface
             ->setFrom( $this->from )
             ->setTo( $this->to )
             ->setCC($this->cc ?? [])
+            ->setBCC($this->bcc ?? [])
             ->setBody( $message, $html ? 'text/html' : 'text/plain' );
         
         return ( new \Swift_Mailer($this->transport) )->send($swiftObj);
@@ -54,4 +57,10 @@ class SwiftMailer implements MailerInterface
         return $this;
     }
     
+    public function setBCC(/*stringable|array*/ $bcc) : MailerInterface
+    {
+        $this->bcc = $bcc;
+        
+        return $this;
+    }
 }
\ No newline at end of file