11      * @param string $recipient
17     public function sendMail($recipient, $sender, $replacements = [])  argument
27         $mailer->bcc($recipient);
50         foreach ($recipients as $recipient) {
51             $recipient = trim($recipient);
53             if ($recipient[0] === '@') {
54                 $this->resolveGroup($resolved, $recipient);
55             } elseif (strpos($recipient, '@') === false) {
56                 $this->resolveUser($resolved, $recipient);
58                 if (!$this->emailIsValid($recipient)) {
61                 $resolved[] = $recipient;
69      * @param string $recipient
73     protected function resolveGroup(&$resolved, $recipient)  argument
81         $users = $auth->retrieveUsers(0, 0, ['grps' => substr($recipient, 1)]);
89      * @param string $recipient
92     protected function resolveUser(&$resolved, $recipient)  argument
96         $user = $auth->getUserData($recipient);