Feature

Validate Emails with Precision and Speed

Protect your sender reputation and improve deliverability by validating every email — instantly or in bulk.

Trusted by companies worldwide

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Why choose SendPost Validation API

Keep your email lists clean and your campaigns effective. Our fast, secure, and comprehensive validation system helps ensure every email counts.

Safeguard Your Deliverability

Prevent bounces and spam issues by verifying email addresses before sending.

  • Reduce bounce rates and protect domain reputation
  • Block disposable or typo-ridden emails
  • Catch spam traps and honeypots
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Real-Time & Bulk Validation

Validate emails instantly via API or upload lists for bulk cleansing.

  • Results in milliseconds via REST API
  • CSV uploads for large-scale batch cleaning
  • Email status reports and analytics
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Secure & Developer Friendly

Integrate fast with API keys, SDKs, and secure protocols.

  • REST API with clear documentation
  • Support for 14+ programming languages
  • Account and Sub-account level key controls
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How Email Validation Works

Validate emails via REST API or CSV upload. Fast response. Clean data. Better inboxing.

1

Authenticate with Your API Key

Use either account or sub-account level API keys in your headers to authenticate requests.

2

Validate Single or Bulk Emails

Use `/api/v1/account/validate` for batch lists or validate single addresses with real-time lookup.

3

Interpret Results & Take Action

Check MX records, detect spam traps, and take proactive action to clean your list.

Frequently asked questions

Everything you need to know about SendX and email marketing

How fast is the validation API?

You get validation results in milliseconds for individual emails. Bulk uploads are processed efficiently and return status updates via API.

What types of issues are detected?

Our API detects MX failures, disposable domains, common typos, spam traps, and honeypot addresses.

Is integration easy?

Yes! We offer SDKs in 14+ languages and use standard REST principles with clear auth headers and JSON responses.

Can I integrate SendPost with my own application?

Absolutely. SendPost is designed for developers. We offer a robust Email API, SMTP relay service, and SDKs in over 14 programming languages. Additionally, our Email Webhooks allow you to receive real-time event data directly in your application for seamless integration and workflow automation.

Do you offer a free plan or trial?

Yes, we offer a very generous free forever plan that includes up to 25,000 free emails every month. This plan is designed to give you the freedom to build, test, and fully integrate SendPost into your application without any cost or commitment. No credit card is required to sign up.

Still have questions? We're here to help.

Ready to Reach the Inbox, Every Time?

Join thousands of developers and businesses who trust SendPost's powerful API and infrastructure to deliver their most important emails.