Apparently, the email is you "key identifier" it can only be changed by QlikTech / Moderators.
You can ask that to Sara Leslie : http://community.qlik.com/people/sli
You probably received the messages from your post or groups.
Since you tried the user preferences, I suggest you check your groups. On the menu on the right, you may find a 'Stop email notifications' button.
Hope it helps,
I see that your also having concerns about your profile data. If you need to update your profile email address please feel free to submit a request directly to me at firstname.lastname@example.org
Thank you for sharing your concerns.
It sounds like you have opted into receive email updates in a sub community. We send out a weekly digest on Thursdays but all other email updates are 'opt-in'. Here are the examples and how to deal with them.
You are receiving emails from a sub-community ie Development. Go to that community page and on the right hand side under Actions/Notifications you will see either Receive email notifications OR Stop email notifications. Just click on Stop email notifications.
You would also receive email notifications when anyone comments on a thread or document you created so that you have the opportunity to respond to them. That is a built in function. If you feel that your thread or document doesn't need any more responses you can feel free to 'lock' it (found on that content items page under the Action menu).
Let me know if this takes care of the issue and thanks for posting your concern.