That mjt.lu link is Mailjet tracking/redirect infrastructure used by many sites for transactional email delivery. It ultimately redirects to the real community.unix.com activation URL.
The links are also part of our email delivery and anti-spam infrastructure, helping protect the forum against abuse, spam, and delivery issues.
If you are uncomfortable clicking tracked links, you can always manually copy and paste the displayed community.unix.com activation URL into your browser instead.
In any case, since this site does not use those default Mailjet tracking settings, I have now disabled click tracking in Mailjet, so those somewhat “distrustful-looking” mjt.lu links should disappear going forward.
