Hi, I'm not sure if this can be configured in the mother-ship, but as I say in the title the spanish forums lack the option "Notify of updates by email". Brazilian and German forums do have it...
I've opened a thread there two weeks ago and got no answers.
But it's not new, months ago I mentioned it, a moderator replied but didn't answered about this issue. Nonetheless, not having added the post feed to my rss reader, I didn't saw his answer until recently...