Reply To: Categories to INCLUDE option not EXCLUDE

For anyone else interested in doing this I did it easily by changing the two occurrences of:
$this->feed_excluded_categories .= ‘-’ . $c->cat_ID . ‘,’;
in newsletter-pro/plugin.php to:
$this->feed_excluded_categories .= $c->cat_ID . ‘,’;

Also you might want to change in newsletter-pro/feed.php:
<th>Max posts and categories to EXCLUDE</th>
TO:
<th>Max posts and categories to INCLUDE</th>

So you know its changed.

And you will have to make this change with every time you update the plugin.