Mailchimp is a Email delivery service. It can be used in drupal sites for sending emails for our subscribers . Drupal Provides a mailchimp module for this services.

1. First we have to start a account in mailchimp.
2. Go to mailchimp.com and create an account in it.
3. Generate the API key by going to account/extras/API key.
4. Goto our site and download the mailchimp module and its dependencies.
   • Mailchimp
   • Mailchimp Activity
   • Mailchimp Lists
5. Then download the Mailchimp Api Library and rename it as 'mailchimp' and save it in Sites/all/libraries folder.
6. Enable the Mailchimp modules.
7. Goto admin/config/webservices/mailchimp.
8. Inside the Global settings Paste the API key that generated earlier in Field Mailchimp API key.
9. Goto tab Lists. Add a new List. It will also be Generated in our Mailchimp.
10. Then goto tab Signup forms and create a new signup form. (We can also generate the signup form Directly from the Mailchimp account and it can be merged to this Signup form).
11. Select the created new list under the Mailchimp list.
12. Select Display mode as Block or Page.

Also we can change the submit button text and confirmation message.

13. Select the merge fields checkbox that linking to the account.There is a option called “Require subscribers to Double Opt-in”, if we select it Mailchimp will send a confirmation mail to the subscribers about the Subscription.
14. Save the settings.

Then if any additional styling or design to the form is required it can be done inside the Mailchimp account signup forms.

15. Display the block or page in our prefered Destination.

Our Mailchimp Subscription form is ready. We can send Emails to our subscribers using our Mailchimp Account.