Magento: How To Subscribe Customer Email Id To Newsletter Subscription List Automatically

Sometimes we need to auto subscribe the customer email address without knowing to customer if he visit to our site or click on any events in the site .So in magento that functionality is also available but that generally goes through customer permission .but here you can set by below code to newsletter subscription list .

Magento : Auto Newsletter Subscription For Both Guest And Register User

Hi friends I have a post which only subscribe the email of customer as a guest user automatically .But now acording to my your update I am writing this article which will subscribe the email id to newsletter subscription section by checking whther that eamil already registered or not. If that email id is resistered the subscription will be saved as like below