Probably you want to find out what this domain is used for. Well, we will tell you the purpose.
Let's assume you are a business customer who orders an e-mail marketing campaign. Wouldn't you be interested wether your campaign was successful or not?
Well, our customers represent very different well-known companies and they are very interested in the success of their campaigns.
Because we want to satisfy both our business customers and our e-mail subscribers we use this domain for e-mail marketing campaign tracking. So it is anonymous and harmless to you.