If they really want that information, they will type it correctly.

Since you cannot check if an email exists anyway, the most useful type of form data validation for emails is the one that catches typos, which is to have them enter the email twice and validate that they match (same as when you ask for password confirmation).

In reply to Re^2: On Validating Email Addresses by Thilosophy
in thread On Validating Email Addresses by dws

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