If you use a third-party for some of your emails, you might use that third-party's name. Before You Start Click tracking is enabled in all MailChimp campaigns by default, and is required in all free accounts and new paid accounts. Unfortunately, reports would be misleading if one or more outbound sites didn’t use Analytics.
Thus, short URLs may be more convenient for websites or hard copy publications (e.g. a printed magazine or a book), the latter often requiring that very long strings be broken into multiple lines (as is the case with some e-mail software or internet forums) or truncated. Another operational limitation of URL shortening services is that browsers do not resend POST bodies when a redirect is encountered. You can change your URL up to five times within six months.
See if you are using Classic Analytics (ga.js) or Universal Analytics (analytics.js).