<human>: Someone is using my wife's email address as their Yahoo mail backup contact address. It is of the form firstname@firstname.org.  We occasionally get password change notifications because of it.

Am I legally allowed to log into their account, using the 'forgot password' option, and remove it myself? After all, we 100% own our email address and they choose to use it.  Yahoo requires me to replace it with another backup email, so I'd have to make one up (bad idea) or set up a free throwaway account somewhere and use that. I'm nervous about doing that in particular.

I've asked abuse@yahoo.com to remove it ages ago, and they said they did, but it's still in use. I would have emailed the user himself but if he ignored me, or said no, and I fix it myself, I don't want retribution against my wife since he obviously will know who did it...

Can you give me a shortened version of the text?
<bot>: Is it legal to log into someone's email account to remove their mistaken use of my own address as their backup email? May result in them being blocked out of their account.