Validate email addresses with syntax checking, domain validation, and deliverability hints.
Email validation checks whether an address is syntactically plausible and sometimes whether the domain looks capable of receiving mail. It reduces typos at signup but cannot guarantee deliverability or ownership.
RFC-compliant email syntax is surprisingly complex; practical validators balance strictness with UX so valid uncommon addresses are not always rejected.
No. Only a confirmation message or provider API can prove that.
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