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Lies we tell ourselves about email addresses

Developers routinely underestimate the complexity of email address validation, relying on oversimplified regex rules that fail on edge cases allowed by RFC standards. Common myths include case-insensitivity, deliverability implied by syntax validity, and uniqueness assumptions that break with subaddressing or dot-normalization. The article serves as a reminder that email, despite feeling familiar, remains a surprisingly deep protocol with many traps for the unwary.