Ok in this way the feed contains the author mail, but i want the name of author instead.

But it seems work fine now.

This is something we can't control it, it actually rely on the Joomla RSS feed libraries.

If you would like to achieve this, you have to modify on this file ->
JoomlaFolder/libraries/joomla/document/renderer/feed/rss.php

// LINE 210

. htmlspecialchars($data->items[$i]->authorEmail . ' (' . $data->items[$i]->author . ')', ENT_COMPAT, 'UTF-8') . "</author>\n";



// Replace with

. htmlspecialchars($data->items[$i]->author, ENT_COMPAT, 'UTF-8') . "</author>\n";

By the way, glad to hear that your issue has been resolved now.

As a gentle reminder, kindly start a new thread if you have any other issue in the future so it will be easier for us to manage your inquiry. I will lock and mark this thread as resolved.