There are a number of ways to get this corrected, each time consuming. Gmail will not help you since the address is a valid address and they have no way to filter the messages between your old and his email address
If the messages that are for you are meaningful, he will need to forward them to you so that you can change the receiving email address to your new address or unsubscribe. You will have to do this for approximately 2 months before the flow ceases after that he can respond to the emails to unsubscribe. With such a short email address, It is possible that if he changes email addresses, he could have the same problem. The moral is to make sure you have a failrly uniques address name of at least 8 characters. Sorry for the bad news.
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