Question 1

What does Mailgun Validation do?

Accepted Answer

Mailgun Email Validation is an email verification service built into the Mailgun email platform, powered by real-world delivery data from billions of emails sent through Mailgun's infrastructure. Because Mailgun operates one of the largest email sending platforms globally, its validation engine uses actual send history and recipient engagement data — not just DNS checks — to make more accurate predictions about whether a given email address is deliverable.

Available as a standalone validation API or as part of the Mailgun Optimize suite, the service enables Nigerian developers and businesses to validate email addresses in real time at point of entry, or clean existing lists in bulk before campaigns, reducing bounce rates that damage domain sender reputation.

## What the API Does

Mailgun email validation performs multi-layer verification:

- **Syntax check**: Validates email address format.
- **Domain validation**: Verifies that the domain exists and has valid DNS records.
- **MX record check**: Confirms the domain has mail exchange records configured to receive email.
- **Mailbox existence**: Verifies the specific mailbox exists on the mail server via SMTP probing.
- **Disposable email detection**: Flags addresses from temporary email services.
- **Risk assessment**: Leverages Mailgun's historical send data to assign deliverability risk scores based on whether similar addresses have historically been undeliverable, bounced, or marked as spam.

The Mailgun Optimize plan adds inbox placement testing (verifying your emails actually reach inboxes, not spam folders) and email preview rendering (testing how your email looks across email clients) alongside validation.

## How Developers Use It

Real-time validation via REST API: `GET https://api.mailgun.net/v4/address/validate?address=user@example.com` authenticated with HTTP Basic Auth (username: `api`, password: `YOUR_API_KEY`).

Bulk validation: Upload a CSV file through the Mailgun dashboard or API and retrieve validated results by file ID.

## Pricing & Fees

- **Optimize Plan**: $49/month — includes 2,500 email validations, 25 inbox placement tests, and 500 email preview renders per month.
- **Add-on validation on Foundation+**: $1.20 per 100 validations as overage.
- **Email sending**: Separate from validation — Mailgun offers free 100 emails/day for sending, with paid sending plans starting at $15/month.

Note: After October 2025, Mailgun increased pricing on its Flex send plan by 100%. Verify current pricing at mailgun.com/pricing before committing.

## Authentication

HTTP Basic Authentication. Username is always the literal string `api`; password is your Mailgun API key. This scheme is shared across all Mailgun API calls (email sending, validation, analytics).

## Rate Limits

Rate limits depend on your plan. The Optimize plan includes 2,500 validations/month. Overage above the plan limit is billed per 100 validations. Real-time API throughput is not explicitly published — contact Mailgun for high-volume limit details.

## Compliance & Regulations

Mailgun is GDPR compliant and SOC 2 Type II certified. Email addresses submitted for validation are processed per Mailgun's data processing agreement. For Nigerian deployments under NDPR, Mailgun's data handling policies support appropriate treatment of user email data.

## Challenges & Gotchas for Nigerian Developers

1. **Validation separate from sending**: The Optimize plan for validation is separate from Mailgun's email sending plans. You may need two plans (one for sending, one for validation) if you use both.
2. **Catch-all domains**: Corporate Nigerian email domains configured as catch-all return "risky" or "unknown" results — Mailgun cannot definitively confirm individual mailbox validity on catch-all domains.
3. **Price increase awareness**: Mailgun increased its Flex send plan pricing by 100% in December 2025. Review current pricing at mailgun.com before subscribing.
4. **USD billing**: Mailgun charges in USD. Nigerian developers need a USD-capable payment method.
5. **Best used within the Mailgun ecosystem**: Mailgun Validation is most valuable if you're already using Mailgun for email sending — combining both means validation and delivery in one account and one API key.

## Company Background

Mailgun was founded in 2010 in San Francisco as a developer-focused transactional email API. The company was acquired by Sinch (a Swedish communications platform) in 2021. Mailgun serves over 150,000 businesses globally and processes over 100 billion emails per year. The email validation product is part of Mailgun's Optimize suite, which also includes inbox testing and email preview tools.

## Frequently Asked Questions

**Q: Do I need a Mailgun sending account to use email validation?**
A: No. Email validation is available as a standalone product through the Mailgun Optimize plan without requiring a sending subscription.

**Q: How accurate is Mailgun email validation?**
A: Mailgun claims industry-leading accuracy by leveraging real delivery data from billions of emails sent through its platform, not just DNS checks.

**Q: What's the difference between Mailgun Validate and ZeroBounce?**
A: ZeroBounce is a standalone validation specialist with more detailed categorization (spam traps, abuse emails, etc.) and non-expiring credits. Mailgun Validate is best for teams already in the Mailgun ecosystem who want validation + inbox testing + email delivery in one platform.

**Q: Is there a free trial for validation?**
A: Mailgun provides some validation credits with account registration. The Optimize plan includes validation, inbox testing, and email preview starting at $49/month.

Question 2

How much does Mailgun Validation cost?

Accepted Answer

Mailgun Validation is a paid API. Optimize plan: $49/month (2,500 validations + 25 inbox tests + 500 email previews). Foundation+: $1.20 per 100 validations overage. Free: 100 emails/day (send only, not validation).

Question 3

How do I authenticate with the Mailgun Validation API?

Accepted Answer

HTTP Basic Auth — username: "api", password: YOUR_API_KEY

Question 4

Is there a rate limit on Mailgun Validation?

Accepted Answer

Depends on plan. Optimize: 2,500 validations/month base.

Question 5

Does Mailgun Validation offer a sandbox or test mode?

Accepted Answer

Yes — Mailgun Validation provides a sandbox or test environment so you can integrate and test before going live.

Question 6

What is Mailgun Validation best suited for?

Accepted Answer

Nigerian developers and businesses already using Mailgun for transactional email who want to add email validation to the same platform — reducing email bounces with inline real-time validation and bulk list hygiene.

Question 7

Is there anything else I should know before integrating Mailgun Validation?

Accepted Answer

Mailgun Validation is part of the Mailgun Optimize product suite. Validation credits are separate from email sending credits. Real-time API and drag-and-drop bulk list validation both supported. Mailgun leverages cached send data from billions of emails for industry-leading validation accuracy.

Question 8

Where can I find Mailgun Validation's documentation?

Accepted Answer

The official API documentation is at https://documentation.mailgun.com/docs/mailgun/api-reference/openapi-final/tag/Email-Validation/. The provider's website is https://www.mailgun.com.

Question 9

Does Mailgun Validation support Nigerian developers?

Accepted Answer

Yes — Mailgun Validation explicitly supports Nigerian developers/use cases.

Mailgun Validation

Features Included

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Key Highlights

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