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Email validation in production: regex, MX, SMTP, and the trade-offs nobody tells you
Published on March 20, 2026By DEV Community
Most email validation tutorials stop at regex. That's fine for a toy project. In production, bad emails cost you money — bounced sends hurt sender reputation, disposable signups inflate metrics, and typos mean a real user never gets your onboarding email. This isn't a tutorial about regex. It's about what to actually check, when, and what the trade-offs are. What to validate on the frontend Keep it fast and non-blocking. The frontend's job is to catch obvious mistakes before the user submits, no
Read the full article: https://dev.to/padymies/how-to-validate-emails-properly-in-your-app-beyond-regex-1e9g
Source: DEV Community