Newsletter service, still Mailchimp?

I need a newsletter service for a WordPress blog and the only one I know of is Mailchimp. I can see it has a lot of great advanced features, however I feel it's very messy to work with, also it requires a bit of work to set up a pretty template. For now I just need something that gets me over the hills fast and easy while still looking good.

Do you have any other suggestions to a newsletter service? Preferably something that works good with WordPress.