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SPECIFICTION
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MailboxValidator

mailboxvalidator.com

Free plan WebAPI
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Spec score 7.9 #12 of 31 in Email Verification APIs

What it is

MailboxValidator checks email addresses and mailboxes to flag invalid addresses and help reduce email bounces. It is available on the web and through an API, with single-address results returned as JSON or XML. For lists, users can upload text or CSV files for bulk validation. Checks cover syntax, MX records, SMTP responses, greylisting, disposable and free-provider addresses, role addresses, suppression, DMARC, strict SPF, and website reachability. The company says it tests the connection through the SMTP server without sending a message to the recipient. Listed integrations include Zapier, Make, MailChimp, Mailgun, SendGrid, HubSpot, and others; API documentation links libraries for Node.js, Ruby, PHP, Perl, Python, Java,.NET, Go, and Rust. The free API plan is free, billed per month, with 300 queries and 30-day validity. A bulk trial is free for 100 queries and 30-day validity. Yahoo validations are unsupported, and non-ASCII addresses are marked invalid syntax. The FAQ says refunds are not offered; its privacy policy says processed personal data is retained indefinitely, subject to policy limits on deletion requests.

Spec sheet

Purpose
MailboxValidator checks email addresses and mailboxes to identify invalid addresses and help reduce email bounces.Read 9 Oct 2026 · mailboxvalidator.com
Integrations
Listed integrations include Zapier, Make, MailChimp, AWeber, Mailgun, SendGrid, Campaign Monitor, SparkPost, HubSpot, MailerLite, Constant Contact, VerticalResponse, MooSend, Mailjet, iContact, ActiveCampaign, Intercom, Autopilot, ChatGPT, and MCP.Read 9 Oct 2026 · mailboxvalidator.com
Security
Hexasoft says it maintains technical, administrative, and physical measures reasonably designed to help protect personal data from unauthorized processing.Read 9 Oct 2026 · mailboxvalidator.com
Support
The privacy policy lists [email protected] and says to allow up to four weeks for a reply to privacy inquiries.Read 9 Oct 2026 · mailboxvalidator.com
Headquarters
Penang, MalaysiaRead 28 Sep 2026 · mailboxvalidator.com
API results
The single email validation API returns results in JSON or XML.Read 9 Oct 2026 · mailboxvalidator.com
ASCII limitation
The FAQ says only purely ASCII email addresses are validated; non-ASCII characters are marked as invalid syntax.Read 9 Oct 2026 · mailboxvalidator.com
Bulk validation
Users can upload an email list in text or CSV format for bulk validation.Read 9 Oct 2026 · mailboxvalidator.com
Privacy and retention
The privacy policy says personal data processed through the service is retained indefinitely, though a deletion request may be submitted subject to the policy's limitations.Read 9 Oct 2026 · mailboxvalidator.com
Refunds
The FAQ states that the service does not offer refunds.Read 9 Oct 2026 · mailboxvalidator.com
Supported developers
The API documentation links SDK modules or libraries for Node.js, Ruby, PHP, Perl, Python, Java, .NET, Go, and Rust.Read 9 Oct 2026 · mailboxvalidator.com
Validation checks
Checks include syntax, MX records, SMTP response, greylisting, disposable addresses, free providers, role addresses, suppression, DMARC, strict SPF, and website reachability.Read 9 Oct 2026 · mailboxvalidator.com
Validation method
The company says it does not send an email to the recipient during checking and instead tests the connection using the SMTP server.Read 9 Oct 2026 · mailboxvalidator.com
Yahoo limitation
The service states that it does not support Yahoo email validations at this time.Read 9 Oct 2026 · mailboxvalidator.com

Plans and prices

API-FREE Free Per Month 300 Queries · Auto Renewal · Auto Recharge · Standard Support · 30-Day Validity Read 9 Oct 2026 · mailboxvalidator.com
API-FREE+ Free Per Month 600 Queries · Auto Renewal · Auto Recharge · Standard Support · 30-Day Validity · By invitation only Read 9 Oct 2026 · mailboxvalidator.com
BULK-TRIAL Free 100 Queries · Standard Support · < 1 hour · 30-Day Validity Read 9 Oct 2026 · mailboxvalidator.com
BULK-1 $19.95, paid once 1,000 Queries · Email Support · < 4 hours · $0.02 / Query · 30-Day Validity Read 9 Oct 2026 · mailboxvalidator.com
BULK-5 $39.95, paid once 5,000 Queries · Email Support · < 4 hours · $0.008 / Query · 30-Day Validity Read 9 Oct 2026 · mailboxvalidator.com
BULK-10 $59.95, paid once 10,000 Queries · Email Support · < 4 hours · $0.006 / Query · 30-Day Validity Read 9 Oct 2026 · mailboxvalidator.com
BULK-50 $149.95, paid once 50,000 Queries · Email Support · < 12 hours · $0.003 / Query · 30-Day Validity Read 9 Oct 2026 · mailboxvalidator.com
BULK-100 $199.95, paid once 100,000 Queries · Email Support · < 24 hours · $0.002 / Query · 30-Day Validity Read 9 Oct 2026 · mailboxvalidator.com
BULK-500 $399.95, paid once 500,000 Queries · Email Support · < 48 hours · $0.0008 / Query · 30-Day Validity Read 9 Oct 2026 · mailboxvalidator.com
BULK-1000 $699.95, paid once 1,000,000 Queries · Email Support · < 72 hours · $0.0007 / Query · 30-Day Validity Read 9 Oct 2026 · mailboxvalidator.com

Every MailboxValidator plan and price →

Strong points and limits

Strong points

  • Bulk validation accepts text and CSV lists.
  • Single-address API returns JSON or XML.
  • Checks include disposable addresses and DMARC.
  • API libraries cover nine programming languages.

Limits

  • Yahoo email validations are unsupported.
  • Non-ASCII addresses are marked invalid syntax.
  • The FAQ says refunds are not offered.
  • Personal data is retained indefinitely, subject to policy limits.

Who it suits

MailboxValidator suits teams that need to check individual addresses through an API or validate uploaded lists. Its integrations and language libraries may also suit developers connecting validation to existing tools.

Verdict

MailboxValidator specifies its validation checks, API outputs, bulk workflow, and integration options. Before relying on it, account for the Yahoo and ASCII limitations and review its stated data-retention policy.

Where Specifiction places it

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