I was messing up with the template when I came across the link to a gif, but it's broken. Since I'm a little bit curious about what was it, I'll open this thread to discuss the new one 😉😉

Exact line can be found here: https://github.com/leemunroe/responsive-html-email-template/blob/master/email.html#L392

Btw, this is not a real code issue.

Ah this line — was just a link to a silly gif. You should replace this with your ESPs unsubscribe link.