Antideo
10 API requests per hour for email verification, IP, and phone number validation in the free tier. N…
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Free
ZeroSMTP
Free SMTP relay on the msgwing.com domain, up to 200 emails/day, no paid tier. Sends from a shared @msgwing.com address only (no custom domain). Ready-to-run code examples in 15 languages plus Windows
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Freemium
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