Found the same question asked 4 months ago with no real answer..
(note the last reply at the end is not a link to a plug-in that solves the issue.. A handy plugin, but off the mark nonetheless)
I set up a blog for a friend and initially administrated it using my own email account. Now I want to cut ties to the site and let him have all the fun. Seems that changing the principal email address in the Settings screen has not changed the fact that all new comments are still coming to my email address and not his.
Is there a place in the control panel where I can specify what email address (or addresses) new comment notifications should be sent to?