Magento – Magento 1.9.3.4 Mails not sending

I don't like that method of providing your own frontName, I prefer to overload the existing admin router because it's neat and quick. Start by changing this in your config.xml:

<admin>
    <routers>
        <adminhtml>
            <args>
                <modules>
                    <ics_easylife before="Mage_Adminhtml">Ics_EasyLife_Adminhtml</ics_easylife>
                </modules>
            </args>
        </adminhtml>
    </routers>
</admin>

This will make magento check for controller classes that start with Ics_EasyLife_Adminhtml before checking it's own Mage_Adminhtml. Rename your controller to Ics_EasyLife_Adminhtml_EasylifeController and rename it's corresponding file to EasylifeController.php.

Now an URL of adminhtml/easylife will expand to http://ipaddress/ics/admin/easylife/index and call your indexAction method. When making a menu entry use that URL of adminhtml/easylife. Even if you don't have any layout or blocks in place yet at least a page will show. When writing a layout use the layout handle <adminhtml_easylife_index>.

Here are the issues with your module.
First of all lose the local in the folder path. There are no more codepools in magento 2.
So your module.xml should be placed in app/code/Magento/Hello/etc/module.xml. Do the same for the rest of the files.
And by the way. Use an other vendor name. Leave Magento for the core team. It works if you use the same one, but it's not a best practice.
Second...lose the <sequence> tag from module.xml. The way you did it, you tell Magento that your module needs to be loaded before itself which can't be done. The <sequence> tag is used to force load order and helps Magento deal with circular dependencies that haven't been removed yet.

Third...the layout file should not be placed in etc. It should be in app/code/Magento/Hello/view/frontend/layout/hello_index_index.xml.

The same goes for the template file. It should be in app/code/Magento/Hello/view/frontend/templates/success.phtml

And as a tip. In the controller you should not use $this->_view. It is deprecated and it will be gone soon. Instead make your controller look like this:

<?php
namespace Magento\Hello\Controller\Index;
class Index extends \Magento\Framework\App\Action\Action
{
    protected $resultPageFactory;
    public function __construct(
        \Magento\Framework\App\Action\Context $context,
        \Magento\Framework\View\Result\PageFactory $resultPageFactory
    )
    {
        parent::__construct($context);
        $this->resultPageFactory = $resultPageFactory;
    }
    public function execute()
    {
        return $this->resultPageFactory->create();
    }
}

And clear the contents of folder var/generation