Would it be possible to add the ability to be notified when certain players join or leave the server?

Thanks for the suggestion. Will be added shortly. The updated mod can be downloaded at Curseforge when it is approved.

It doesn't seem to work as I thought, the player is only reported when he is in render distance. My idea was that the player would be reported when he joins the server, regardless of my location (appearing or disappearing from the server's tablist).

And I didn't get a leave message at all.

It should work globally now. But if a target is on the server already you'd have to check manually.

Thank you, you are the best!