I find Mailchimp hard to use but I have been using the free version for my blog for a long time.
I used MailerLite for my Kickstarter Campaign and I found it easy to use.
I am using Constant Contact now but there isn’t a free version. They have amazing customer support though so it might be worth it to sign up and use it for the duration of your Kickstarter campaign. You can always “pause” Constant Contact when your Kickstarter is over to avoid paying additional fees.
Has anyone else used a company that they recommend? Thanks for sharing!