When you create a wallet you receive an email to your email adress. In that mail there is a connect link to your wallet. People are so stupid that they lose even they email adress
Depends on what wallet you use, most wallets dont need e-mail address.
If you want to really have a secure wallet adress you register it with a e-mail adress or maybe a phone number . Or you simply write on a piece of paper that details for login and wallet number
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all these things are in the category of super risky bitcoin wallets and if you are using email it means you are using a third party to generate the bitcoin wallet which will also introduce a whole lot of risk of trusting a third party.
the only solution is cold storage that is done right, all other methods have some sort of risk, some low and some higher risks.
