For OP it shouldn't be a big deal, because forwarding is just a temporary aid while transitioning from one email address to the other. I've just about complete

For OP it shouldn't be a big deal, because forwarding is just a temporary aid while transitioning from one email address to the other. I've just about completed the move (to runbox) without forwarding and it wasn't that big of deal. Just set aside a bit of time every once in a while to update all the accounts that are still sending to my gmail account. Eventually I'll set up a permanent auto-reply saying "this account is no longer monitored, please contact me at xxxxxxx@runbox.com".