Gui the test mail button is intentionally disabled by us in order to prevent abuse, you can use "Reset password" function to test mail instead.
This might sound a bit overhead, but it is much needed, since the test mail button doesn't have any cooldown applied by default and one user could spam it & bring our mail server down. To prevent this, I've applied a permanent throttle to the test mail route, and since I am not a PHP programmer, it's the way it is for now
