I understand wanting to track clicks and e-mail opens but there needs to be a little sanity here. Take this example from a Twilio "your account has a ToS update" e-mail I just received:
- The text says the URL is "www.twilio.com/legal/tos"
- The actual (modified by me to be generic) URL is: http://s815114181.t.en25.com/e/er?s=987654321&lid=0011&elq=123456789012345678901234567890ab
Why on Earth would we want users to click a link that looks like that? Why not at least use a link that is the same as the actual link but with query parameters or, even better, why track the clicking of this link at all?