Basic campaign tracking with google Analytics

Basic campaign
utm_source = newsletter, facebook, website
utm_medium = email, post, website
utm_campaign = different for each campaign
utm_content = different for each ad in a campaign

Visit https://support.google.com/analytics/answer/1033867?hl=en to build your links

e.g http://www.domain.com/?utm_source=newsletter&utm_medium=email&utm_campaign=xmas_special