Email security on registration form: Is it safe?

346360 pts.
Tags:
Email security
Security
A member of our team has been making updates to one of our sites and he implemented a feature (on the registration form) that checks if an email address is still available for use. But he's nervous if it's secure to show a user if an email address is already taken.

Could it be a security risk for members? How should we defend it against bots looking for email addresses?

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