$app->post('/sendemail', function ($request, $response) {
    //Save info process
    $message =  saveDataBaseInfo();

    if ($message == "OK") {

        // Send email
        $res = sendEmail("Some text", "<p>Some text</p>", "Some subject", "email@email.com");

        if ($res == "Fail") {
            return $res;
        } else {
            return Functions::createMessageReturnToClient("", Types::EnviarMensagem, $message);
        }
    }
});

public function sendEmail($body, $bodyHtml, $subject, $emailTo) {

    $mail = new PHPMailer;

    $mail->SingleTo = true;
    $mail->isSMTP();
    $mail->Host = 'myHost';
    $mail->SMTPAuth = true;
    $mail->Username = 'theuser';
    $mail->Password = '******';
    $mail->SMTPSecure = 'tls';
    $mail->Port = 587;
    $mail->setFrom("emailfrom@emailfrom.com", "", false);
    $mail->addAddress($emailTo);
    $mail->isHTML(true);

    $mail->Subject = $subject;
    $mail->Body = $bodyHtml;
    $mail->AltBody = $body;
    $send = $mail->send();

    if (!$send) {
        return "Success"
    } else {
        return "Fail";
    }
}