I bought a lot of games with my old mail address. I changed it some years ago by adding my new one as primary and deleting the old one.

Now i clicked on "get steam key" on the purchase page of a game that was bought with the old address and the confirmation mail was only sent to my old address. Heaven thanks i can still access it. I also re-added the old address as secondary account.

But is there a way to associate all purchases to the new address so i can really get rid of the old address?

You’ll have to contact support and they can update the email address associated with the transaction.

Thank you! I will do that.