diff --git a/src/Email/SymfonyMailer.php b/src/Email/SymfonyMailer.php
index 2ef87c6..e234d5b 100644
--- a/src/Email/SymfonyMailer.php
+++ b/src/Email/SymfonyMailer.php
@@ -73,12 +73,12 @@ class SymfonyMailer implements MailerInterface
 
     protected function cc() : array
     {
-        return $this->arrayToAddress($this->cc);
+        return $this->arrayToAddress($this->cc ?? []);
     }
 
     protected function bcc() : array
     {
-        return $this->arrayToAddress($this->bcc);
+        return $this->arrayToAddress($this->bcc ?? []);
     }
 
     protected function arrayToAddress(string|\Stringable|array $array) : array
@@ -86,7 +86,12 @@ class SymfonyMailer implements MailerInterface
         $list = [];
 
         foreach((array) $array as $addr => $name) {
-            $list[] = "$name <$addr>";
+            if (is_numeric($addr)) {
+                $list[] = $name;
+            }
+            else {
+                $list[] = "$name <$addr>";
+            }
         }
 
         return $list;