Email Validation API
Verify email addresses in real-time with 99.2% accuracy. SMTP verification, disposable email detection, and catch-all checks. Bulk validation for entire lists. Validate then send with confidence using 11 official SDKs.
Looking for a non-technical overview? See our email validation service page.
curl -X POST https://api.mailodds.com/v1/validate \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{"email": "user@example.com"}'
Why Email Validation Matters
Wasted Budget
Every email sent to an invalid address costs money. ESPs charge per send, and bounced emails deliver zero ROI.
Damaged Reputation
ISPs track your bounce rate. Exceed 2% and your emails start landing in spam folders - or get blocked entirely.
Hidden Threats
Disposable emails, typos, and defunct domains slip through standard forms. Each one pollutes your list and skews metrics.
API Request and Response
Three steps to validated emails. One endpoint, clean JSON response.
Send an Email
Single POST request with the email address. That's it. Works from any language.
Get Instant Verification
SMTP verification, MX lookup, disposable detection, and more - all in under 300ms.
Act on the Result
Clear action recommendations: accept, reject, or flag for review. No guesswork.
REST API Features
Everything you need for comprehensive email validation via a single API endpoint.
Real-Time SMTP Verification
Connect directly to mail servers to confirm the mailbox exists. Not just format or MX checks.
Disposable Email Detection
Block 190,000+ temporary email domains. Stop throwaway signups before they waste resources.
Bulk Email Validation
Upload CSV/Excel files with up to 100,000 emails. Async processing with real-time progress.
Webhook Notifications
Get notified when bulk jobs complete. HMAC-SHA256 signed payloads for security.
Suppression Lists
Maintain custom block/allow lists. Match by email, domain, or MD5 hash.
Validation Policies
Custom rules for automatic accept/reject decisions. Tailor validation to your use case.
Why Email Validation Matters
"According to data published by HubSpot, the average email list decays by 22.5% annually, making real-time validation a technical necessity for maintaining sender reputation."
"According to Validity's 2025 Email Deliverability Benchmark, 1 in 5 marketing emails never reaches the inbox, costing businesses an estimated $3.5 billion in lost revenue globally each year."
"According to Google's 2024 Bulk Sender Guidelines, senders processing more than 5,000 emails per day must maintain bounce rates below 0.3%, making proactive list validation essential for deliverability."
"According to Return Path research, senders with bounce rates above 2% see a 20% drop in inbox placement across major ISPs, directly impacting campaign ROI."
Test the API Instantly
No signup required. Enter any email address and see the full API response in real time. The playground uses the same validation engine that powers production API calls.
{
"email": "test@example.com",
"status": "invalid",
"action": "reject",
"sub_status": "mailbox_not_found",
"mx_found": true,
"smtp_provider": "",
"did_you_mean": null,
"free_provider": false,
"role_account": false,
"disposable": false
}SDKs and Code Examples
Official SDKs for 11 languages. Enterprise clients include retry, typed errors, and webhook verification.
CRM Integrations
Native integration guides for Salesforce (10 Apex patterns), HubSpot, Klaviyo, and more. Validate emails directly inside your CRM without middleware.
View all integrations
Why Developers Choose MailOdds
| Criteria | MailOdds | Typical Providers |
|---|---|---|
| Response Time | <300ms | 300-500ms typical |
| Data Location | EU (Germany) | Usually US-based |
| Free Tier | 50/month + 1,000 trial credits | Often trial-only |
| Entry Pricing | From EUR 9/month | Often €20+ for entry |
| API Simplicity | 1 endpoint, clean JSON | Multiple endpoints, SDKs required |
| Credit Expiration | Never | Often 12 months |
99.2% accuracy across 1M+ real-world validations
Measured against actual delivery outcomes, not synthetic test sets. MailOdds uses deep SMTP verification to confirm mailbox existence at the server level, catching invalid addresses that format-only or MX-only checks miss entirely.
Transparent Pricing
Start free. Scale as you grow. No hidden fees.
Frequently Asked Questions
Validate, Then Send
MailOdds validates every recipient before delivery. Combine validation with our sending API for zero-bounce email infrastructure.
Related Resources
Python Email Validation Guide
Step-by-step tutorial for validating emails with Python and the MailOdds SDK.
Email Deliverability Guide
Authentication, list hygiene, and sender reputation strategies to reach the inbox.
Email Validation Rules
RFC 5322 format rules, common pitfalls, and the five levels of email validation.
Compare Email Validation Providers
Side-by-side comparison of MailOdds with ZeroBounce, NeverBounce, Bouncer, and more.
Free Email Validator Tool
Validate any email address instantly in your browser. No signup required.
Postman Collection
Download the official Postman collection to test all API endpoints with pre-configured authentication.
Email Validation Resources
Guides, comparisons, and tools to help you get the most from email validation.
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