We currently provide the following integrations with MailChimp and Aweber.
Go to Dashboard > Settings > Integrations
Click the connect button and then enter the required details, which you can obtain from your Email Service Provider account.
After you have linked either MailChimp or Aweber, all emails collected through iRefer will then automatically synch with your Email Service Provider. You can choose your list from within the Campaign settings here.
More integrations on their way!