MailboxValidator API

Email · Operational · 30d uptime 100%
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MailboxValidator email validation clean email lists and reduces bounce. It connects to the mail server and checks whether the mailbox exists or not.

Trust signals

Pricing
FREEMIUM
Auth
API_KEY
CORS
No
Rate limit
Free tier with rate limits.
Health
377ms
Trust score
87 (B)

Last checked Oct 19, 2026 · uptime 24h 100% / 7d 100% / 30d 100%

Strong candidate; weakest signal is CORS.

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Integration checklist

  • Auth is API_KEY
  • No CORS — route calls through your backend.
  • Rate limit: Free tier with rate limits.
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