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MailboxValidator
Penang, Malaysia
What it is
MailboxValidator checks email addresses and mailboxes to identify invalid addresses and help reduce email bounces. Users can validate a single address through an API that returns JSON or XML, or upload a text or CSV list for bulk checks. Validation covers syntax, MX records, SMTP response, greylisting, disposable and free-provider addresses, role addresses, suppression, DMARC, strict SPF, and website reachability. The company says it tests a connection through the SMTP server rather than sending a message to the recipient. 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. API documentation links libraries for Node.js, Ruby, PHP, Perl, Python, Java, .NET, Go, and Rust. The free API plan lists 300 queries with 30-day validity; the free bulk trial lists 100 queries with the same validity. Yahoo validation is unsupported, and non-ASCII addresses are marked as invalid syntax. The FAQ says refunds are unavailable, and the privacy policy says processed personal data is retained indefinitely, subject to policy limits on deletion requests.
For and against
For
- Bulk uploads accept text and CSV lists.
- API results are available in JSON or XML.
- Checks include disposable addresses, DMARC, and strict SPF.
- Free API plan lists 300 queries with 30-day validity.
- Documentation links libraries for nine programming languages.
Against
- Yahoo email validation is unsupported.
- Non-ASCII email addresses are marked invalid.
- Personal data is retained indefinitely, subject to policy limits.
- The service does not offer refunds.
The verdict
MailboxValidator offers both single-address API checks and bulk list validation, with a broad set of listed checks and integrations. Confirm its Yahoo and ASCII limitations, query validity, and data retention terms before choosing it.
Who it suits
MailboxValidator suits teams that need to check individual addresses through an API or validate uploaded lists in bulk. Its documented integrations and language libraries may help teams connecting checks to existing services or applications.
Plans and prices
API-FREE
300 Queries · Auto Renewal · Auto Recharge · Standard Support
Read 9 Oct 2026 · mailboxvalidator.com
API-FREE+
600 Queries · Auto Renewal · Auto Recharge · Standard Support
Read 9 Oct 2026 · mailboxvalidator.com
BULK-TRIAL
100 Queries · Standard Support · < 1 hour · 30-Day Validity
Read 9 Oct 2026 · mailboxvalidator.com
BULK-1
1,000 Queries · Email Support · < 4 hours · $0.02 / Query
Read 9 Oct 2026 · mailboxvalidator.com
BULK-5
5,000 Queries · Email Support · < 4 hours · $0.008 / Query
Read 9 Oct 2026 · mailboxvalidator.com
BULK-10
10,000 Queries · Email Support · < 4 hours · $0.006 / Query
Read 9 Oct 2026 · mailboxvalidator.com
BULK-50
50,000 Queries · Email Support · < 12 hours · $0.003 / Query
Read 9 Oct 2026 · mailboxvalidator.com
BULK-100
100,000 Queries · Email Support · < 24 hours · $0.002 / Query
Read 9 Oct 2026 · mailboxvalidator.com
BULK-500
500,000 Queries · Email Support · < 48 hours · $0.0008 / Query
Read 9 Oct 2026 · mailboxvalidator.com
On the record
- API results
- The single email validation API returns results in JSON or XML.mailboxvalidator.com · read 9 Oct 2026
- ASCII limitation
- The FAQ says only purely ASCII email addresses are validated; non-ASCII characters are marked as invalid syntax.mailboxvalidator.com · read 9 Oct 2026
- Bulk validation
- Users can upload an email list in text or CSV format for bulk validation.mailboxvalidator.com · read 9 Oct 2026
- 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.mailboxvalidator.com · read 9 Oct 2026
- 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.mailboxvalidator.com · read 9 Oct 2026
- Purpose
- MailboxValidator checks email addresses and mailboxes to identify invalid addresses and help reduce email bounces.mailboxvalidator.com · read 9 Oct 2026
- Refunds
- The FAQ states that the service does not offer refunds.mailboxvalidator.com · read 9 Oct 2026
- Security
- Hexasoft says it maintains technical, administrative, and physical measures reasonably designed to help protect personal data from unauthorized processing.mailboxvalidator.com · read 9 Oct 2026
- Support
- The privacy policy lists [email protected] and says to allow up to four weeks for a reply to privacy inquiries.mailboxvalidator.com · read 9 Oct 2026
- Supported developers
- The API documentation links SDK modules or libraries for Node.js, Ruby, PHP, Perl, Python, Java, .NET, Go, and Rust.mailboxvalidator.com · read 9 Oct 2026
- Validation checks
- Checks include syntax, MX records, SMTP response, greylisting, disposable addresses, free providers, role addresses, suppression, DMARC, strict SPF, and website reachability.mailboxvalidator.com · read 9 Oct 2026
- 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.mailboxvalidator.com · read 9 Oct 2026
- Yahoo limitation
- The service states that it does not support Yahoo email validations at this time.mailboxvalidator.com · read 9 Oct 2026
