Act now. - create a new email address somewhere else, preferably with your own domain - redirect all your emails to your new account - send an auto reply: "I

Act now. - create a new email address somewhere else, preferably with your own domain - redirect all your emails to your new account - send an auto reply: "I don't use this email address anymore, and I may not see this email. My new address is XXX" The third point is a lie that nudges people into updating their addressnook a lot faster. If you just silently redirect they might not even notice. But you can explain in a sentence why you are doing this. This redirect+auto reply can be left in place forever.