12      * @param string $recipient
18     public function sendMail($recipient, $sender, $replacements = [])  argument
28         $mailer->bcc($recipient);
51         foreach ($recipients as $recipient) {
52             $recipient = trim($recipient);
54             if ($recipient[0] === '@') {
55                 $this->resolveGroup($resolved, $recipient);
56             } elseif (!str_contains($recipient, '@')) {
57                 $this->resolveUser($resolved, $recipient);
59                 if (!$this->emailIsValid($recipient)) {
62                 $resolved[] = $recipient;
70      * @param string $recipient
74     protected function resolveGroup(&$resolved, $recipient)  argument
82         $users = $auth->retrieveUsers(0, 0, ['grps' => substr($recipient, 1)]);
90      * @param string $recipient
93     protected function resolveUser(&$resolved, $recipient)  argument
97         $user = $auth->getUserData($recipient);