Not related. This app do not send any email; it executes the CORE function. Example on approve account:
/**
* Approve Members Awaiting Validation
*
*/
protected function approve()
{
try
{
$member = \IPS\Member::load( \IPS\Request::i()->id );
}
catch ( \OutOfRangeException $e )
{
\IPS\Output::i()->error( 'node_error', '2C114/A', 404, '' );
}
$member->validationComplete();
if ( \IPS\Request::i()->isAjax() )
{
\IPS\Output::i()->json( 'OK' );
}
}
When you click in the link, it runs the validationComplete(), which is a CORE method.
The plugin only displays the exact same thing that you see in the ACP.
Now seriously, you have a bunch of problems that no one else had, even me, using it on my online board, which clearly indicates that your install isn't so good.
I suggest you to remove the plugin, clear cache (using the tool or removing all files from datastore folder. If it still insists, then provide steps to reproduce to "fix the issue", beside then "click in the link", because I can't reproduce it.