How to send auto login email using Email Auto Login drupal module?
First of all to send out an email automatically you will need a triggering event – and probably also some condition, under which the action of 'sending' should be fired. Otherwise drupal will not know when to send out an email – and to whom.

I suppose you have a look at the Rules Module (https://www.drupal.org/project/rules). It might first look quite complex, but basically it consists of these three main elements you have to configure to add a new Rule to your webpage: Event, Condition and Action. With that you can automate almost everything, especially sending reminder-emails etc. – and most probably you can also trigger Email Auto login.