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About Mailboxlayer
What Is Mailboxlayer?
Mailboxlayer is a developer-focused email verification API. It checks email addresses for syntax errors, typos, MX records, SMTP existence, and whether they are from free, disposable, or catch-all domains. Results return in lightweight JSON, helping apps separate real users from low-quality contacts.
Who Is It For?
It is built for developers, SaaS platforms, e-commerce stores, and marketing teams who need to validate emails at signup or in bulk. It is not for non-technical users who need a drag-and-drop interface — the API requires basic coding skills to integrate.
Real-World Use Cases
Use mailboxlayer to reduce bounce rates in email campaigns, block disposable emails during registration, and verify user lists before import. It powers apps in CRM, email marketing, and customer onboarding workflows.
Key features
- Syntax & Typo Check — Automatically catch common email typos and suggest corrections.
- Real-Time SMTP Verification — Confirm an email address actually exists on the receiving server.
- Free & Disposable Email Detection — Filter out temporary or throwaway addresses using a daily updated provider database.
- Catch-All Detection — Identify domains that accept all emails, reducing false positives.
- Deliverability Score — Get a quality score from 0 to 1 to prioritize high-value contacts.
- 256-bit HTTPS Encryption — All API requests are secured end-to-end.
- Interactive Documentation — Test API endpoints live within the docs.
SaaSpartout Score
7.3
/10
Editorial score from our review methodology — not user ratings.
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Mailboxlayer Pricing
Mailboxlayer pricing: from $9.99/mo. Billing model: Subscription.
For comparison: the median starting price in Analytics & Data is $39/month, measured across 274 tools we track. See the full SaaS Pricing Index →
Free Plan
100 API requests per month, syntax & typo check, free & disposable database, quality score, MX records check, 256-bit HTTPS encryption. No support.
Basic Plan — $14.99/month (or $161.99/yearly)
5,000 requests plus pay-as-you-go. Includes catch-all detection, standard support, all free features.
Professional Plan — $74.99/month (or $787.99/yearly)
50,000 requests plus pay-as-you-go. Bulk endpoint for up to 25 emails.
Enterprise Plan — $249.99/month (or $2,549.99/yearly)
250,000 requests plus pay-as-you-go. Bulk endpoint for up to 100 emails, higher discount.
All paid plans come with a free tier of 100 monthly requests — no credit card required to start.
Exclusive deal via SaaSpartout
Get the deal →Frequently asked questions
Is Mailboxlayer free?
Yes, there is a free plan offering 100 API requests per month with basic features. No credit card required.
How much does Mailboxlayer cost?
Paid plans start at $14.99/month for 5,000 requests. The next tiers are $74.99/month (50,000 requests) and $249.99/month (250,000 requests). All pricing is per month or annual with up to 15% discount.
How does Mailboxlayer work?
You send a GET request with an email address to the API endpoint. It checks syntax, domain MX records, and optionally connects via SMTP to verify the inbox exists. Results return as JSON with a quality score.
What is the SMTP check accuracy?
The SMTP check is accurate in most cases for detecting if an email address actually exists, though some edge cases (e.g., servers that accept all mail) can affect results.
Who is Mailboxlayer best for?
Developers and businesses that need to validate email addresses in real-time during signup, form submissions, or data imports. It's ideal for reducing bounce rates and blocking disposable emails.
What are the top Mailboxlayer alternatives?
Popular alternatives include ZeroBounce, NeverBounce, Hunter Email Verifier, and Kickbox. Each offers similar verification APIs with different pricing and features.
