Comment by Turing_Machine

If you want your real email address to be shown instead, this procedure seems to work:

On your Timeline page go to Update Info, then click Contact Info. Set the fake address to "Hidden from Timeline" and your real address to "Shown on Timeline" (assuming you do want your real address visible, of course).

I hope this saves some time for others; it took a little while for me to figure it out. Other things I tried: Deleting the fake address (you can't). Setting the fake address as visible to only me (had no apparent effect, though perhaps it made the fake address invisible to others).