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Questions relating to the usage of email as it relates to the User Experience, such as copywriting in emails or displaying email addresses.

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Should I have both username and email for registration/sign up?

The email is needed in case the user forgets their password, and for reply notifications, etc. The username is a familiar handle that isn't their email address, maybe their online pseudonym. … For user registration, the minimum information you need is an email address and password, but do store a username too, as it's the norm and people wouldn't want their email address to be publicly visible …
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