Pop\Mail\Queue::addRecipients PHP Method

    public function addRecipients($rcpts)
    {
        $regEx = '/[a-zA-Z0-9\\.\\-\\_+%]+@[a-zA-Z0-9\\-\\_\\.]+\\.[a-zA-Z]{2,4}/';
        // If single, but not valid
        if (!is_array($rcpts) && !preg_match($regEx, $rcpts)) {
            throw new Exception("Error: You must pass at least one valid email address.");
            // Else, if single and valid
        } else {
            if (!is_array($rcpts)) {
                $this[] = array('email' => $rcpts);
                // Else if an associative array of scalar values
            } else {
                if (is_array($rcpts) && isset($rcpts['email'])) {
                    if (!preg_match($regEx, $rcpts['email'])) {
                        throw new Exception("Error: The email address '" . $rcpts['email'] . "' is not valid.");
                    }
                    $this[] = $rcpts;
                    // Else if a numeric array of scalar values
                } else {
                    if (is_array($rcpts) && isset($rcpts[0]) && !is_array($rcpts[0])) {
                        foreach ($rcpts as $email) {
                            if (!preg_match($regEx, $email)) {
                                throw new Exception("Error: The email address '" . $email . "' is not valid.");
                            }
                            $this[] = array('email' => $email);
                        }
                        // Else, if an array of arrays
                    } else {
                        if (is_array($rcpts) && isset($rcpts[0]) && is_array($rcpts[0])) {
                            foreach ($rcpts as $rcpt) {
                                if (!isset($rcpt['email'])) {
                                    throw new Exception("Error: At least one of the array keys must be 'email'.");
                                } else {
                                    if (!preg_match($regEx, $rcpt['email'])) {
                                        throw new Exception("Error: The email address '" . $rcpt['email'] . "' is not valid.");
                                    }
                                }
                                $this[] = $rcpt;
                            }
                        } else {
                            throw new Exception("Error: The recipients parameter passed was not valid.");
                        }
                    }
                }
            }
        }
        return $this;
    }

 /**
  * Add recipients to the queue
  *
  * @param  mixed $rcpts
  * @throws Exception
  * @return \Pop\Mail\Mail
  */
 public function addRecipients($rcpts)
 {
     $this->queue->addRecipients($rcpts);
     return $this;
 }