MailboxValidator

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What MailboxValidator is

MailboxValidator checks email addresses and mailboxes to identify invalid addresses and help reduce email bounces. You can upload a text or CSV list for bulk validation, or send a single address to its API and receive results in JSON or XML. 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 rather than sending an email to the recipient. 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 lists 300 queries per month with 30-day validity, while the free bulk trial lists 100 queries with 30-day validity. Yahoo validations are unsupported, and only purely ASCII addresses are validated; non-ASCII characters 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.

Who it suits

It suits teams that want to check individual addresses through an API or validate uploaded text and CSV lists. Developers can refer to linked libraries for several programming languages.

What it does well

Bulk validation accepts text or CSV lists.
Single-address API results are available in JSON or XML.
Checks include disposable addresses, DMARC, and strict SPF.
Free API plan lists 300 queries per month.

What to know first

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

Limits

The free API-FREE plan includes 300 queries per month with 30-day validity. The free BULK-TRIAL includes 100 queries with 30-day validity. Non-ASCII addresses are marked invalid, Yahoo validations are unsupported, and credits do not roll over.

Plans

Plan	Billed and limits	Price
API-FREE	Per Month · 300 Queries · Auto Renewal · Auto Recharge · Standard Support · 30-Day Validity	Free
BULK-TRIAL	100 Queries · Standard Support · < 1 hour · 30-Day Validity	Free
API-FREE+	Per Month · 600 Queries · Auto Renewal · Auto Recharge · Standard Support · 30-Day Validity · By invitation only	Free
BULK-50	50,000 Queries · Email Support · < 12 hours · $0.003 / Query · 30-Day Validity	$149.95, paid once
BULK-1	1,000 Queries · Email Support · < 4 hours · $0.02 / Query · 30-Day Validity	$19.95, paid once
BULK-100	100,000 Queries · Email Support · < 24 hours · $0.002 / Query · 30-Day Validity	$199.95, paid once
BULK-5	5,000 Queries · Email Support · < 4 hours · $0.008 / Query · 30-Day Validity	$39.95, paid once
BULK-500	500,000 Queries · Email Support · < 48 hours · $0.0008 / Query · 30-Day Validity	$399.95, paid once

The first 8 of 10 plans, as mailboxvalidator.com lists them, read 9 Oct 2026. The maker's own page has the final word. Every plan

Getting started

Open https://www.mailboxvalidator.com/.
Choose web access or API access for your validation workflow.
For bulk validation, prepare an email list in text or CSV format.
For API use, consult the documentation and linked language libraries.
Choose the free API plan, free bulk trial, or a paid bulk query pack.

Verdict

MailboxValidator offers both API and bulk-list checking, with a wide set of validation checks and integrations. Before choosing it, consider its Yahoo and non-ASCII limitations, and review the stated retention policy.

Questions

Does MailboxValidator have a free plan or trial?

Yes. API-FREE lists 300 queries per month, and BULK-TRIAL lists 100 queries. Both have 30-day validity.

How much do the bulk plans cost?

BULK-1 costs $19.95, paid once for 1,000 queries. Other listed one-time packs range up to BULK-1000 at $699.95, paid once for 1,000,000 queries.

What platforms does MailboxValidator support?

Its listed platforms are web and API.

Can it check Yahoo or non-ASCII email addresses?

Yahoo email validations are unsupported. Non-ASCII addresses are marked as invalid syntax.

Does it send an email during validation?

The company says it tests the connection using the SMTP server rather than sending a message to the recipient.

Does MailboxValidator offer refunds?

No. Its FAQ says the service does not offer refunds.

Facts from MailboxValidator's own pages

API results: The single email validation API returns results in JSON or XML. · mailboxvalidator.com, 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, 9 Oct 2026
Bulk validation: Users can upload an email list in text or CSV format for bulk validation. · mailboxvalidator.com, 9 Oct 2026
Headquarters: Penang, Malaysia · mailboxvalidator.com, 28 Sept 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, 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, 9 Oct 2026
Purpose: MailboxValidator checks email addresses and mailboxes to identify invalid addresses and help reduce email bounces. · mailboxvalidator.com, 9 Oct 2026
Refunds: The FAQ states that the service does not offer refunds. · mailboxvalidator.com, 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, 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, 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, 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, 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, 9 Oct 2026
Yahoo limitation: The service states that it does not support Yahoo email validations at this time. · mailboxvalidator.com, 9 Oct 2026