I test drove several email services before deciding to go with Mad Mimi. They provide enough features to send a good looking email campaign, with a very intuitive interface. There aren't a bunch of bells and whistles, and you don't need to earn a Phd....
PHPList provides editors as add-ons, CKEditor being the best of the batch. PhpList includes complex statistics, such as subscribers who chose not to receive messages in the future. It is also great because it has many payment facilities for premium...
When you upload a list of contact from your database, when they bounce these people automatically block your account and wont respond to the emails or reactivate the account and wont even refund the paid amount
I think that the customer service could be more accesible.