roundcubemail/plugins/acl/acl.php
protected function mod_login($user)
    {
        $login_lc = $this->rc->config->get('login_lc');

        if ($login_lc === true || $login_lc == 2) {
            $user = mb_strtolower($user);
        }
        // lowercase domain name
        else if ($login_lc && strpos($user, '@')) {
            list($local, $domain) = explode('@', $user);
            $user = $local . '@' . mb_strtolower($domain);
        }

        return $user;
    }
protected function mod_login($user)
    {
        $login_lc = $this->rc->config->get('login_lc');

        if ($login_lc === true || $login_lc == 2) {
            $user = mb_strtolower($user);
        }
        // lowercase domain name
        else if ($login_lc && strpos($user, '@')) {
            list($local, $domain) = explode('@', $user);
            $user = $local . '@' . mb_strtolower($domain);
        }

        return $user;
    }
protected function mod_login ( $ user ) { $ login_lc = $ this -> rc -> config -> get ( 'login_lc' ) ; if ( $ login_lc === true || $ login_lc == 2 ) { $ user = mb_strtolower ( $ user ) ; } // lowercase domain name else if ( $ login_lc && strpos ( $ user , '@' ) ) { list ( $ local , $ domain ) = explode ( '@' , $ user ) ; $ user = $ local . '@' . mb_strtolower ( $ domain ) ; } return $ user ; }
Modify user login according to 'login_lc' setting
Modify user login according to login_lc setting