Hi everyone! 
I'm following now 17 Communities here in "VMware Communities". For that, I have authenticated with my user (e-mail address: vmware AT ricmarques DOT net) and clicked on the "Start following this community" link, for each of those communities.
For most of those communities, I have clicked in the "Receive email notifications" link, in the right hand side, to receive each new message (in "Discussions") in my mailbox. That has worked perfectly: I'm "subscribed" and receiving those messages as e-mails.
However, some of the "Communities" that I have chosen to get email notifications are very active, and they started "flooding" my mailbox. So I thought to keep following those Communities BUT stopping email notifications. So, I went to the most active Communities that I was following and clicked on the "Stop email notifications" hyperlink (in the place that previously read "Receive email notifications"). When I did that, the "Stop email notifications" text turned back again to "Receive email notifications", apparently confirming that I had "unsubscribed" from getting e-mail notifications.
The problem is: I'm still getting email notifications for the "Communities" that I've chosen to stop receiving them! 
Here's one example of a community that I have clicked on "Stop email notifications" days ago, but I'm still getting the e-mail messages:
VMware Communities: VMware vCenter™ Server
http://communities.vmware.com/community/vmtn/server/vcenter/vc?view=discussions&start=0
Is this a known issue ("bug"), affecting everyone, or is it something related to my user account?
Thanks in advance!
Cheers,
Ricardo