Hello,
I subscribed with a email address I would to change. I could do it for the mail site login profile, but not for the forum.
Now I log in with email #2, but I receive notifications on email #1.
I see email #2 in the forum profile, but I cannot change it.
How can I change notification email ???
PM the webmaster and ask.
I emailed and PMed some administrators. No reply.
10 days ago, I asked Jean-François, a French moderator to forward my request. He did it.
No reply from the administrators since now =(
email webmaster@arduino.cc
OK, I will send him a mail. that email helped me to register 
Hello,
I got a reply from the webmaster (seems one of my email address is black-listed, don't know why) : there is a bug.
I changed the main email twice and now, the notification email is well replicated and working !