Smart Email Deliverability Verification and Domain Health API

API ID 13111

Leverage our smart API for unparalleled email verification and domain health solutions to maximize reach.

API Documentation

Endpoints

Request

Verify domains with DNS, MX, SPF, DMARC, registration, infrastructure, and security checks, delivering trust scores and validation insights instantly.

Endpoint ID: 26568
GET https://zylalabs.com/api/13111/smart+email+deliverability+verification+and+domain+health+api/26568/domain+deliverability+and+health+check
INPUT PARAMETERS

Domain Deliverability and Health Check — Endpoint Features

Object Description
domain Required The domain to analyze (an email address also works — the domain is extracted). e.g. stripe.com

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

domain
API EXAMPLE RESPONSE
JSON
{"domain":"stripe.com","score":97,"grade":"high","email":{"provider":"Google Workspace","has_mx":true,"spf":{"present":true,"policy":"soft"},"dmarc":{"present":true,"policy":"reject"},"is_disposable":false},"registration":{"registrar":"SafeNames Ltd.","created":"1995-09-12T04:00:00Z","expires":"2027-09-11T04:00:00Z","age_days":11255},"infra":{"hosting":"AWS Route 53","ips":["198.202.176.161","198.137.150.161"],"has_valid_cert":true},"dns":{"a":["198.202.176.161","198.137.150.161"],"aaaa":[],"mx":["aspmx.l.google.com","alt2.aspmx.l.google.com","alt1.aspmx.l.google.com","aspmx3.googlemail.com","aspmx2.googlemail.com"],"ns":["ns-1087.awsdns-07.org","ns-1882.awsdns-43.co.uk","ns-423.awsdns-52.com","ns-705.awsdns-24.net"],"txt":["asv=8de0c1a866b958297e22a36216e594a6","whimsical=253112f9add9790f3a27b9d9893626451fc4cda1","v=MCPv1; k=ed25519; p=WMeka0C1fIH9HQLMtsSM9DD9cM6Bz6Wz34mHnK86UcM=","facebook-domain-verification=m7id9rt8ehlgcg9tt2yggbsi6gro7i","canva-site-verification=xLypn0D9XANRy-lbwcMfHA","google-site-verification=qjP3OAiraClha_40cX9Z9FrG5q3O_0InXSamXOswY-s","google-site-verification=hPfjsDwiisKJ4RP1ExOst9gAOD_0P8Q7-kxdcKUvEcc","apple-domain-verification=8kIS0gmJTvILWQuI","docusign=4c9f5602-1c19-4e4c-bde7-77dc4b9ea8a0","docusign=4a93db58-af07-4632-a881-b569d41a6c57","h1-domain-verification=KhpNX9YNAc7bX95agGvFsPPKbYTVe1KC6xj7P1zKZrRzxcuS","fastly-domain-delegation-3c9tdnjzdwy7wfffvyyy-786084-2024-07-08","cursor-domain-verification-vncvvm=D0NzeIDbQa8PPgIf1ukp9UPiu","atlassian-domain-verification=upLp21qQgja1aHG2gnAb1AmXRqb/zG0UK1a0n3zTSXZg5DgOSttR3i5uzA3T9Cdk","docker-verification=ccde1a0d-8d2c-44b5-9d20-6c4e19113fc9","MS=ms80697640","_mphpl78cv3thhugki4dkknlukgj1du6","google-site-verification=NLkFgZLHeVMVYlR3t1UZC9_1LzmqCAefJyNDs6ZQqBA","z4mthhzk10l6qc0rg4211mnnppkh2y5b","anthropic-domain-verification-zk7x9c=QfN52ECybLPUWh51R9pKF0QO3","neat-pulse-domain-verification-8GMn8nv=36eba03d-345e-421a-a823-d6d1f28938a4","google-site-verification=pmz8ueKvWMPxNlwUDcVroF91-tq6I9VM6wSO_0i7-wc","postman-domain-verification=c3b168067b16085c452b04b643ae1000079b095e383b53d1074e409b0e600b6265e1c7963beca1ca87cc63c381dcea332544c92c919651e4cda69f9a6303079c","v=spf1 ip4:198.2.180.60/32 ip4:13.111.2.227/32 include:spf1.stripe.com include:greenhouse-outbound-mail.stripe.com include:_spf.qualtrics.com ~all","00D50000000JV6w=1TBTQ0000000CIv;00DDn000000HWol=1TBVY00000002Hx;00D4x000003vxGL=1TBPQ00000008Tp;00Dfn00000BUlWD=1TBan0000000LPR","edcbf4c7-b604-457b-870e-1b05f655e769","google-site-verification=PrlpJHdk11CIkPsiXoHEAJevWHAk39JRFAqVSe9l7n0","liveramp-site-verification=7gyFkTwGYsvgd7IUQwyAOfImETwR06wgKjKiXq90KEY","elevenlabs=NpcIkVJW_8Vyd2gLKzPviuaU1g5rz83KiWQQ3sWKGtI","stripe-verification=82ce82470fb8324e19fa65abdb6fd370da5a8f90bba09712f259760f625d0790","google-site-verification=ZgGi2-xDdfnaWxdfjn5AqtUS11jKWqSXAV_EHODFzdE"],"cname":[]},"subdomains":["answers.stripe.com","api-e1.stripe.com","api-e2.stripe.com","api-nw1.stripe.com","api-nw2.stripe.com","api-nw3.stripe.com","api-tls12.stripe.com","api-w1.stripe.com","api-w2.stripe.com","api.stripe.com","auth.stripe.com","bfcm.stripe.com","bofa-enhanced-issuer-network.stripe.com","bom.corp.stripe.com","book.stripe.com","button.stripe.com","buy.fastly.cdn.stripe.com","buy.stripe.com","cdn.qa-files.stripe.com","checkout-api-modelt.stripe.com","checkout.fastly.cdn.stripe.com","checkout.stripe.com","cmh.corp.stripe.com","codeint.stripe.com","commerce-mcp.stripe.com","connect-js.stripe.com","connections-auth.stripe.com","connections-barclays.stripe.com","connections-sandbox.stripe.com","corp.stripe.com","cpe.corp.stripe.com","cpe.qa.corp.stripe.com","crypto-js.stripe.com","dashboard-admin.stripe.com","dashboard.stripe.com","donate.stripe.com","east.corp.stripe.com","edge-book.stripe.com","edge-button.stripe.com","edge-buy.fastly.cdn.stripe.com","edge-buy.stripe.com","edge-checkout.fastly.cdn.stripe.com","edge-checkout.stripe.com","edge-donate.stripe.com","edge-invoice.fastly.cdn.stripe.com","edge-invoice.stripe.com","edge-js.fastly.cdn.stripe.com","edge-js.stripe.com","files-cdn.stripe.com","fl.corp.stripe.com","fl.qa.corp.stripe.com","g5-api.stripe.com","git.corp.stripe.com","hoth.stripe.com","invoice.fastly.cdn.stripe.com","invoice.stripe.com","ipaddr-3ds.stripe.com","irc.stripe.com","irs-ides-client.stripe.com","jira.corp.stripe.com","jira.qa.corp.stripe.com","js.fastly.cdn.stripe.com","js.stripe.com","jss.corp.stripe.com","jss.prod.corp.stripe.com","jss.qa.corp.stripe.com","local.corp.stripe.com","m.stripe.com","manage.stripe.com","newapi.stripe.com","northwest.corp.stripe.com","not-a-git.corp.stripe.com","panoplied-respect.stripe.com","partner-ideal-prod.stripe.com","partner-ideal-qa.stripe.com","pay-by-bank.stripe.com","pdx.corp.stripe.com","preprod-bfcm.stripe.com","preprod-button.stripe.com","preprod-checkout.stripe.com","preprod-connect-js.stripe.com","preprod-connections-sandbox.stripe.com","preprod-crypto-js.stripe.com","preprod-g5-api.stripe.com","preprod-invoice.stripe.com","preprod-js.stripe.com","preprod-profile.stripe.com","preprod-public-goods.stripe.com","preprod-secure-files.fastly.cdn.stripe.com","preprod-secure-files.stripe.com","preprod-status.stripe.com","preprod-terminal-statics.stripe.com","preprod-trust.stripe.com","prod-connections-bofa.stripe.com","prod-connections-chase.stripe.com","prod-connections-citi-payload.stripe.com","prod-connections-citi.stripe.com","prod-network-citi-payload.stripe.com","prod-network-citi.stripe.com","prod-partner-amex-east-asia-sponsored-merchant.stripe.com","prod-partner-hdfc.stripe.com","profile.stripe.com","public-goods.stripe.com","qa-bfcm.stripe.com","qa-bom.corp.stripe.com","qa-book.stripe.com","qa-button.stripe.com","qa-buy.stripe.com","qa-checkout.stripe.com","qa-cmh.corp.stripe.com","qa-connect-js.stripe.com","qa-connections-bofa.stripe.com","qa-connections-chase.stripe.com","qa-connections-citi-payload.stripe.com","qa-connections-citi.stripe.com","qa-connections-sandbox.stripe.com","qa-crypto-js.stripe.com","qa-donate.stripe.com","qa-east.corp.stripe.com","qa-edge-testing.stripe.com","qa-files-cdn.stripe.com","qa-g5-api.stripe.com","qa-invoice.stripe.com","qa-js.stripe.com","qa-jwt-connections-barclays.stripe.com","qa-m.stripe.com","qa-network-citi-payload.stripe.com","qa-network-citi.stripe.com","qa-northwest.corp.stripe.com","qa-pandora-v2-test.stripe.com","qa-partner-amex-east-asia-sponsored-merchant.stripe.com","qa-partner-hdfc.stripe.com","qa-pdx.corp.stripe.com","qa-profile.stripe.com","qa-public-goods.stripe.com","qa-secure-files.fastly.cdn.stripe.com","qa-secure-files.stripe.com","qa-status.stripe.com","qa-terminal-statics.stripe.com","qa-trust.stripe.com","qa.corp.stripe.com","revoked.stripe.com","sandbox-acs.stripe.com","secure-files.fastly.cdn.stripe.com","secure-files.stripe.com","sessions.stripe.com","static.stripe.com","status.stripe.com","stripe-credit-ui.stripe.com","stripe.com","support.stripe.com","terminal-statics.stripe.com","test-digicert-cert.stripe.com","trust.stripe.com","verificator.stripe.com","www.api.stripe.com","www.sessions.stripe.com","www.stripe.com"],"subdomain_count":158,"fetched_at":"2026-07-07T02:47:59.061Z"}
Domain Deliverability and Health Check — CODE SNIPPETS

curl --location --request GET 'https://zylalabs.com/api/13111/smart+email+deliverability+verification+and+domain+health+api/26568/domain+deliverability+and+health+check?domain=stripe.com' --header 'Authorization: Bearer YOUR_API_KEY' 


    
Request

Verify email addresses with syntax, SMTP, MX, catch-all, disposable, and deliverability checks, returning confidence scores and validation status instantly.

Endpoint ID: 26569
GET https://zylalabs.com/api/13111/smart+email+deliverability+verification+and+domain+health+api/26569/verify+email+address
INPUT PARAMETERS

Verify Email Address — Endpoint Features

Object Description
email Required The email address to verify. e.g. [email protected]

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

email
API EXAMPLE RESPONSE
JSON
{"email":"[email protected]","status":"risky","deliverable":true,"score":75,"checks":{"syntax":true,"mx":true,"disposable":false,"role_account":false,"free_provider":false,"catch_all":true,"smtp":true},"did_you_mean":null,"verified_at":"2026-07-07T14:32:31.419Z","billed":true}
Verify Email Address — CODE SNIPPETS

curl --location --request GET 'https://zylalabs.com/api/13111/smart+email+deliverability+verification+and+domain+health+api/26569/[email protected]' --header 'Authorization: Bearer YOUR_API_KEY' 


    

API Access Key & Authentication

After signing up, every developer is assigned a personal API access key, a unique combination of letters and digits provided to access to our API endpoint. To authenticate with the Smart Email Deliverability Verification and Domain Health API simply include your bearer token in the Authorization header.

Headers
Header Description
Authorization Required Should be Bearer access_key. See "Your API Access Key" above when you are subscribed.

No long-term commitment. Upgrade, downgrade, or cancel anytime. Free Trial includes up to 50 requests.

(Save 2 months with annual billing 🎉)

🚀 Enterprise Plan

Starts at
$ 10,000/Year


  • Custom Volume
  • Custom Rate Limit
  • Specialized Customer Support
  • Real-Time API Monitoring

Overview

Check any domain's email deliverability and overall domain health in a single API call before you send an email, add it to your CRM, or trust a new signup. Simply send a domain and receive a complete assessment in milliseconds, including email deliverability, domain health, and a unified score from 0 to 100 that makes it easy to decide whether the domain is trustworthy.

The API identifies the email provider such as Google Workspace, Microsoft 365, Zoho, or a self hosted server, verifies SPF and DMARC configurations while returning the actual DMARC policy, checks MX records, and confirms whether the domain is properly configured to send and receive email. It also analyzes domain age, registrar, expiration, TLS certificate validity, hosting provider, CDN, disposable and catch all status, raw DNS records, and subdomains to provide a complete picture of the domain's legitimacy and technical health. Scores between 70 and 100 indicate a healthy, established, and properly configured domain that is safe to email, scores between 40 and 69 suggest a working domain with some potential concerns such as weak email security or a young registration, and scores below 40 highlight domains that are new, disposable, or misconfigured and should be verified before use.

This helps cold email teams avoid wasted sends and protect deliverability, enables lead generation platforms to qualify domains before they enter a CRM, allows applications to block fake or disposable signups in real time, and simplifies deliverability and security audits by validating critical email authentication settings. Unlike other solutions that require multiple services, this API combines domain health, email authentication, mail infrastructure, and trust scoring into one live response while exposing the real DMARC policy instead of a simple yes or no result. It is also designed for AI agents, allowing Claude Code, Cursor, MCP clients, AI SDRs, outreach bots, and automation platforms to understand and use every endpoint directly through machine readable documentation without requiring custom integration logic.

Smart Email Deliverability Verification and Domain Health API FAQs

The "Domain Deliverability and Health Check" endpoint returns a comprehensive assessment of a domain's email deliverability and health, including a score, email provider details, SPF and DMARC configurations, and registration information. The "Verify Email Address" endpoint provides the deliverability status of an email address, including risk level, deliverability score, and checks for syntax, MX records, and account type.

Key fields in the "Domain Deliverability and Health Check" response include "domain," "score," "email," "registration," and "infra." For the "Verify Email Address" endpoint, important fields are "email," "status," "deliverable," "score," and "checks." Each field provides specific insights into the domain or email address's health and deliverability.

The response data is structured in JSON format. For the domain check, it includes nested objects for email, registration, and infrastructure details. The email verification response contains fields for status and checks, allowing users to easily parse and utilize the information for decision-making.

The "Domain Deliverability and Health Check" endpoint provides information on email provider, SPF/DMARC status, MX records, domain age, and overall health score. The "Verify Email Address" endpoint offers deliverability status, risk assessment, and checks for syntax, MX records, and account types, helping users assess email validity.

The data is sourced from DNS records, email authentication protocols (SPF, DMARC), and domain registration databases. This ensures comprehensive coverage of domain health and email deliverability metrics, allowing for accurate assessments of both domains and email addresses.

Typical use cases include validating domains before sending emails, qualifying leads in CRM systems, blocking disposable signups in real-time, and conducting security audits. This data helps improve email deliverability and protects against fraudulent or misconfigured domains.

Users can customize requests by specifying the domain or email address they wish to verify. The API accepts these inputs as parameters, allowing for targeted checks based on user needs. This flexibility enables tailored assessments for specific domains or email addresses.

The API employs multiple quality checks, including validation of DNS records, verification of email authentication settings (SPF, DMARC), and analysis of domain age and registration details. These checks ensure that the data returned is reliable and reflects the current status of the domain or email address.

General FAQs

To obtain your API key, first sign in to your account and navigate to the API you want to use. From the API's Pricing section, choose a plan and complete the subscription process. Once subscribed, return to the API page and you will see your API Access Key displayed at the top of the documentation page. You can use this key to authenticate your requests.

You can’t switch APIs during the free trial. If you subscribe to a different API, your trial will end and the new subscription will start as a paid plan.

The free trial lasts for 7 days and allows you to make up to 50 API requests.

No, the free trial is available only once, so we recommend using it on the API that interests you the most. Most of our APIs offer a free trial, but some may not include this option.

Yes. If the API offers a free trial, you will see a "Free 7-Day Trial" option in its Pricing section. The trial lasts for 7 days and allows up to 50 API requests, enabling you to evaluate the API before subscribing to a paid plan.

Zyla API Hub is like a big store for APIs, where you can find thousands of them all in one place. We also offer dedicated support and real-time monitoring of all APIs. Once you sign up, you can pick and choose which APIs you want to use. Just remember, each API needs its own subscription. But if you subscribe to multiple ones, you'll use the same key for all of them, making things easier for you.

Prices are listed in USD (United States Dollar), EUR (Euro), CAD (Canadian Dollar), AUD (Australian Dollar), and GBP (British Pound). We accept all major debit and credit cards. Our payment system uses the latest security technology and is powered by Stripe, one of the world's most reliable payment companies. If you have any trouble paying by card, just contact us at [email protected]

Additionally, if you already have an active subscription in any of these currencies (USD, EUR, CAD, AUD, GBP), that currency will remain for subsequent subscriptions. You can change the currency at any time as long as you don't have any active subscriptions.
The local currency shown on the pricing page is based on the country of your IP address and is provided for reference only. The actual prices are in USD (United States Dollar). When you make a payment, the charge will appear on your card statement in USD, even if you see the equivalent amount in your local currency on our website. This means you cannot pay directly with your local currency.
Occasionally, a bank may decline the charge due to its fraud protection settings. We suggest reaching out to your bank initially to check if they are blocking our charges. Also, you can access the Billing Portal and change the card associated to make the payment. If these does not work and you need further assistance, please contact our team at [email protected]
Prices are determined by a recurring monthly or yearly subscription, depending on the chosen plan.
API calls are deducted from your plan based on successful requests. Each plan comes with a specific number of calls that you can make per month. Only successful calls, indicated by a Status 200 response, will be counted against your total. This ensures that failed or incomplete requests do not impact your monthly quota.
Zyla API Hub works on a recurring monthly subscription system. Your billing cycle will start the day you purchase one of the paid plans, and it will renew the same day of the next month. So be aware to cancel your subscription beforehand if you want to avoid future charges.
To upgrade your current subscription plan, simply go to the pricing page of the API and select the plan you want to upgrade to. The upgrade will be instant, allowing you to immediately enjoy the features of the new plan. Please note that any remaining calls from your previous plan will not be carried over to the new plan, so be aware of this when upgrading. You will be charged the full amount of the new plan.
To check how many API calls you have left for the current month, refer to the 'X-Zyla-API-Calls-Monthly-Remaining' field in the response header. For example, if your plan allows 1,000 requests per month and you've used 100, this field in the response header will indicate 900 remaining calls.

You can monitor your API usage through the response headers included with every request:

x-zyla-api-calls-monthly-used: Shows the total number of API requests you have used during the current billing period.
x-zyla-api-calls-monthly-remaining: Shows the number of API requests you have remaining for the current billing period.

The 'X-Zyla-RateLimit-Reset' header shows the number of seconds until your rate limit resets. This tells you when your request count will start fresh. For example, if it displays 3,600, it means 3,600 seconds are left until the limit resets.

Yes, you can cancel your subscription at any time. Simply go to the Pricing section of the API you're subscribed to and click the "Unsubscribe" button.

Please note that upgrades, downgrades, and cancellations take effect immediately. Once your subscription is canceled, access to the service will end immediately, regardless of any remaining API calls in your quota.

After 7 days, you will be charged the full amount for the plan you were subscribed to during the trial. Therefore, it's important to cancel before the trial period ends. Refund requests for forgetting to cancel on time are not accepted.
When you subscribe to an API free trial, you can make up to 50 API calls. If you wish to make additional API calls beyond this limit, the API will prompt you to perform an "Start Your Paid Plan." You can find the "Start Your Paid Plan" button in your profile under Subscription -> Choose the API you are subscribed to -> Pricing tab.
You can contact us through our chat channel to receive immediate assistance. We are always online from 8 am to 5 pm (EST). If you reach us after that time, we will get back to you as soon as possible. Additionally, you can contact us via email at [email protected]

Please have a look at our Refund Policy: https://zylalabs.com/terms#refund