Unfortunately, there is no way for us to know which email address is associated with your Keepsafe account.
If you cannot remember what email address you were using with Keepsafe, you can go into each email account you own and send a message to support@getkeepsafe.com from each one of them. In the subject line of each message, please write "Is this email registered with Keepsafe?"; we will then let you know which one (if any) is linked to your account.