Sending to invalid emails kills deliverability. Most validators cost $20-50/month.
Built my own. Three checks: syntax (regex), MX record (DNS), SMTP handshake (connect to mail server, ask "does this mailbox exist?", disconnect).
Stack: FastAPI + Python stdlib. Zero deps. $0/month. 1,000 free/month.
Search "Email Validator API" on RapidAPI.
https://www.producthunt.com/posts/steam-data-api
https://rapidapi.com/user/buigialy30206
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