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InboxTrue review

Freemium#29 of 31 in Email Verification APIs

A focused validation API for large one-off bulk orders and developer workflows.

6.4/10Editor score
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

InboxTrue is an email validation service from MixRank for developers and businesses that need to check addresses before sending messages or accepting signups. Its API covers syntax, DNS and MX records, SMTP mailbox status, disposable or temporary domains, and catch-all domains. The product supports synchronous single-email validation as well as asynchronous bulk jobs, making it suitable for both individual checks and larger address-cleaning workflows.

Pricing is structured around a free tier, pay-as-you-go credits, and an Enterprise plan. The Free tier includes 1,000 validations per month, requires no credit card, and allows 1 request per second. Pay as you go costs $50 one time, has no minimums, lets credits never expire, and does not add a surcharge for realtime versus bulk validation. Enterprise adds custom volume and rate limits, dedicated support, invoicing, and a DPA available on request. This makes the free tier useful for modest validation needs, while the paid model is oriented toward buyers making larger one-off purchases.

The standout capability is the combination of detailed mailbox checks and high-volume processing. Bulk orders can contain up to 200,000 emails, and signed webhooks can report when jobs finish. API key management is handled through the dashboard, and the product is available through web and API interfaces. InboxTrue fits teams that want focused validation primitives and webhook-based bulk processing. Buyers needing broader platform integrations or a lower initial paid commitment should consider alternatives; teams prioritizing SMTP, DNS, catch-all, disposable detection, and large batch capacity have a clearer fit here.

InboxTrue pros and cons

  • Where it wins
    • Bulk validation supports up to 200,000 emails per order
    • Checks SMTP, DNS/MX, disposable, and catch-all status
    • Signed webhooks notify you when bulk jobs are complete
  • Where it doesn't
    • Paid validation starts with a $50 one-time purchase
    • The free tier is limited to 1 request per second
    • Core plans do not list integrations beyond the API and web dashboard

InboxTrue fact sheet, pricing and score →

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