We work with Mailchimp, and in some rare cases, Aweber. But for 99% of business customers, Mailchimp is by far the easiest and most cost effective ESP service to use. We’ve been using Mailchimp since 2003 (!) and they’ve just gotten better over the years! And yes, affilate links are fine in Mailchimp, they just can’t be spammy ones!
If you currently have an account and list(s) with Constant Contact, Emma or Aweber, we can help you move your lists to Mailchimp. In most cases, it will actually lead to a better list, as the process will weed out customers who no longer are interested in your services. It’s always better to have 100 customers who love you and buy your products/services than 10,000 customers who don’t even open your emails!