is "If link is not clickable, copy and paste it into the address bar" really required for verification mails?

I want to make my verification email (or account activation email) really neat with just one "confirm your account" button. However most of the times I've seen that verification email contains below mentioned part.

If the above link is not clickable, try copying and pasting it into the address bar of your web browser.

Is this part really required?
Do we have some statistics around this?