I have Wordpress blog site and I wanted the users to enter their email to subscribe to my blog.If i add any new post in the blog the subscriber should to get the email alerts.

I know this is possible since I have seen in many blogs.

If anyone know how to implement this in Wordpress, let me know.

There's wordpress plugin known as "Email capture wordpress wordpress plugin" which is populated when unique user found your website.This wordpress plugin requesting news latter subscription.

Once user sign up for news latter you are able to send email to multiple customers.Admin may also remove email customers.

You will get more from and screenshort from http://www.my-php-scripts.net/index.php/Wordpress/email-capture-wordpress-plugin-advanced-php.html

Also aweber.com includes a wordpress plugin that combines with Feedburner as well as provides additional functionality.

You will find a couple of good choices for applying an e-mail subscription service for the WordPress blog. (I'm presuming you're while using self located WordPress and never WordPress.com)

Google FeedBurner provides you with probably the most options and is effective with WordPress.

To setup email monthly subscriptions click on the publicize tab within the FeedBurner configurations:

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To effortlessly integrate with FeedBurner you will have to give a redirect for your .htaccess file or use a plugin to do this for you.