Since I have received it multiple times either this person clearly thinks the email is theirs or it's spelled similarly, something to that nature.
If I were to confirm the account, and the person were to start using it, wouldn't I essentially have a "backdoor/trojan horse" of sorts where I could simply reset the password and take control of the account whenever I felt like it? What if it were a bank account instead of a Twitter account, it could have more sinister repercussions.
Other than it being an attack based on pure chance, you can't force someone to try to use your email, is it a viable attack? Is there a term for this kind of attack?