It probably isn't credit card fraud if they didn't actually use your credit card . The most likely issue is a) The merchant doesn't verify email addresses and b) the customer put their email address in incorrectly Just with a minute of checking I found a hundred accounts in my system going to yaho.com, aol.co, gmal.com, etc etc. Imagine the possibilities for fumble-fingering or misremembering the part before the at-s…
>This is the very definition of "accessing a computer system without authorization", which you do not want to be caught doing. I realised this after the fact. I do not know if there is anything I can do to make amends for this.
Not really. Under the Computer Misuse Act you're effectively breaking the law. However there may be a potential defence that you were responding to a query and that your actions would be reasonable. That's a problem to worry about if you were ever to go to court though.