diff --git a/smtp.php b/smtp.php
index aa5d7a9..1705134 100644
--- a/smtp.php
+++ b/smtp.php
@@ -172,7 +172,7 @@ class smtp
                            500);
     $from = $this->cleanMail ($from);
     if (is_string ($to))
-      $to = array ($to);
+      $to = explode (",", $to);
     if (! is_array ($to) || count ($to) === 0)
       throw new \Exception ("Can't send mail: no valid recipient provided",
         500);