I tried to send mail via a user’s profile page and not sure if it worked (there was a warning message saying it might not be sent after submitting the form).
Anyone know if it works?

sparky,

We apologize for the uncertainty of the message system, we have had problems with it within the past year or so.
After some research and repair, our tech team got it a little more stabilized.
I have had fairly consistent success reaching out to other users, though there is the possibility that one or two may not have received anything.
A test mail sent to myself was immediately received, do you have similar results?

Kind regards,
Apoxode