You can automatically signup your affiliates to a specific list in Your MailChimp account. This will allow you to communicate (example: broadcast emails) with your affiliates easily.
Do the following to configure automatic MailChimp signup when an affiliate signs up for an account:
Step 1 (Install the Plugin)
Download and Install the Affiliates Manager MailChimp Integration addon
Step 2 (Go to Settings Interface)
Click on the “MailChimp” menu from the Affiliates Manager plugin’s admin interface.
Step 3 (Specify MailChimp List name and API Key)
Enable the MailChimp signup option. Then enter your MailChimp API key and the list name then save the details.
When your affiliates register for an account, they will be signed up to the MailChimp list you specified in the settings.