My adobe account has an inactive email address associated with it. Can't remember the password?

If you don't have a paid subscription attached to the account, it might be best to create a new account with a valid e-mail address.

You may phone customer service M-F during normal business hours.
https://helpx.adobe.com/contact/phone.html

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How do I Cancel my Paid Subscription?
https://helpx.adobe.com/manage-account/using/cancel-subscription.html

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Subscription & Cancellation Terms:
https://www.adobe.com/legal/subscription-terms.html

You may check with Adobe Customer Support :

https://helpx.adobe.com/contact.html