{
"email": "[email protected]",
"syntax_ok": true,
"local_part_length": 8,
"domain": "example.com",
"has_mx": false,
"mx": [
{
"preference": 0,
"host": ""
}
],
"has_a": true,
"null_mx": true,
"disposable": false,
"role": false,
"free_mail": false,
"verdict": "invalid",
"reasons": [
"domain publishes null MX (accepts no mail)"
],
"note": "DNS checks only, no SMTP probing: whether the mailbox itself exists is not checked. Nothing is stored.",
"sources": [
{
"name": "Live DNS lookup (MX/A/AAAA) via public DNS resolvers"
},
{
"name": "Public disposable-domain blocklist",
"license": "CC0 1.0",
"snapshot": "2026-10-17"
}
]
}
curl --location --request GET 'https://zylalabs.com/api/14519/email+verification+and+dns+check+api/37041/[email protected]' --header 'Authorization: Bearer YOUR_API_KEY'
{
"domain": "github.com",
"status": "NOERROR",
"exists": true,
"dnssec_validated": false,
"records": {
"A": [
{
"data": "140.82.114.3",
"ttl": 27
}
],
"AAAA": [],
"MX": [
{
"data": "0 github-com.mail.protection.outlook.com.",
"ttl": 300,
"priority": 0,
"host": "github-com.mail.protection.outlook.com"
}
],
"NS": [
{
"data": "dns1.p08.nsone.net.",
"ttl": 675
},
{
"data": "dns2.p08.nsone.net.",
"ttl": 675
},
{
"data": "dns3.p08.nsone.net.",
"ttl": 675
},
{
"data": "dns4.p08.nsone.net.",
"ttl": 675
},
{
"data": "ns-1283.awsdns-32.org.",
"ttl": 675
},
{
"data": "ns-1707.awsdns-21.co.uk.",
"ttl": 675
},
{
"data": "ns-421.awsdns-52.com.",
"ttl": 675
},
{
"data": "ns-520.awsdns-01.net.",
"ttl": 675
}
],
"TXT": [
{
"data": "00Dd0000000hHE0=1TBKg000000TN2r",
"ttl": 75
},
{
"data": "MS=6BF03E6AF5CB689E315FB6199603BABF2C88D805",
"ttl": 75
},
{
"data": "MS=ms44452932",
"ttl": 75
},
{
"data": "MS=ms58704441",
"ttl": 75
},
{
"data": "TAILSCALE-xOzoDvFUzZr5YYVCQFuD",
"ttl": 75
},
{
"data": "adobe-idp-site-verification=b92c9e999aef825edc36e0a3d847d2dbad5b2fc0e05c79ddd7a16139b48ecf4b",
"ttl": 75
},
{
"data": "anthropic-domain-verification-4az7qn=if8YWuRRqwLycGJDooumzHtxm",
"ttl": 75
},
{
"data": "apple-domain-verification=RyQhdzTl6Z6x8ZP4",
"ttl": 75
},
{
"data": "atlassian-domain-verification=jjgw98AKv2aeoYFxiL/VFaoyPkn3undEssTRuMg6C/3Fp/iqhkV4HVV7WjYlVeF8",
"ttl": 75
},
{
"data": "calendly-site-verification=at0DQARi7IZvJtXQAWhMqpmIzpvoBNF7aam5VKKxP",
"ttl": 75
},
{
"data": "cursor-domain-verification-gtfwmt=1rfLOtiTngX5QSxD5HvNKTvm3",
"ttl": 75
},
{
"data": "docusign=087098e3-3d46-47b7-9b4e-8a23028154cd",
"ttl": 75
},
{
"data": "facebook-domain-verification=39xu4jzl7roi7x0n93ldkxjiaarx50",
"ttl": 75
},
{
"data": "google-site-verification=82Le34Flgtd15ojYhHlGF_6g72muSjamlMVThBOJpks",
"ttl": 75
},
{
"data": "google-site-verification=UTM-3akMgubp6tQtgEuAkYNYLyYAvpTnnSrDMWoDR3o",
"ttl": 75
},
{
"data": "jamf-site-verification=XtaPNIYghF_e_xRDI8CjgQ",
"ttl": 75
},
{
"data": "krisp-domain-verification=ZlyiK7XLhnaoUQb2hpak1PLY7dFkl1WE",
"ttl": 75
},
{
"data": "loom-site-verification=f3787154f1154b7880e720a511ea664d",
"ttl": 75
},
{
"data": "miro-verification=d2e174fdb00c71e0bcf58f8e58c3da2dd80dcfa9",
"ttl": 75
},
{
"data": "openai-domain-verification=dv-3nh33eQwdkotMIAzLrIDVZo1",
"ttl": 75
},
{
"data": "serval-domain-verification-ydryhj=qbkiEakpwEpTvHh5fIiCqtaue",
"ttl": 75
},
{
"data": "shopify-verification-code=t1YPwcmvnxZyBycaCpk1MPyWoFs72o",
"ttl": 75
},
{
"data": "stripe-verification=f88ef17321660a01bab1660454192e014defa29ba7b8de9633c69d6b4912217f",
"ttl": 75
},
{
"data": "v=spf1 ip4:192.30.252.0/22 include:spf.protection.outlook.com include:_netblocks.google.com include:_netblocks2.google.com include:mail.zendesk.com include:_spf.salesforce.com include:servers.mcsv.net include:mktomail.com include:sendgrid.net ip4:62.253.227.114 ip4:166.78.69.169 ip4:166.78.69.170 ip4:166.78.71.131 ~all",
"ttl": 75
}
],
"CNAME": [],
"CAA": [
{
"data": "0 issue \"digicert.com\"",
"ttl": 3600
},
{
"data": "0 issue \"globalsign.com\"",
"ttl": 3600
},
{
"data": "0 issue \"letsencrypt.org\"",
"ttl": 3600
},
{
"data": "0 issue \"sectigo.com\"",
"ttl": 3600
},
{
"data": "0 issuewild \"digicert.com\"",
"ttl": 3600
},
{
"data": "0 issuewild \"letsencrypt.org\"",
"ttl": 3600
},
{
"data": "0 issuewild \"sectigo.com\"",
"ttl": 3600
}
]
},
"mail": {
"accepts_mail": true,
"mx_hosts": [
"github-com.mail.protection.outlook.com"
],
"spf": "v=spf1 ip4:192.30.252.0/22 include:spf.protection.outlook.com include:_netblocks.google.com include:_netblocks2.google.com include:mail.zendesk.com include:_spf.salesforce.com include:servers.mcsv.net include:mktomail.com include:sendgrid.net ip4:62.253.227.114 ip4:166.78.69.169 ip4:166.78.69.170 ip4:166.78.71.131 ~all",
"spf_all": "~all",
"spf_multiple": false,
"dmarc": "v=DMARC1; p=quarantine; sp=reject; pct=100; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1",
"dmarc_policy": "quarantine",
"dmarc_pct": 100,
"dmarc_rua": "mailto:[email protected]",
"warnings": []
},
"resolver": "primary",
"checked_at": "2026-10-29T00:50:35.640Z",
"sources": [
{
"name": "Public DNS resolvers (DNS-over-HTTPS)"
}
]
}
curl --location --request GET 'https://zylalabs.com/api/14519/email+verification+and+dns+check+api/37042/dns+lookup?domain=github.com' --header 'Authorization: Bearer YOUR_API_KEY'
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 Email Verification and DNS Check API simply include your bearer token in the Authorization header.
| 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.
Verify email addresses and read DNS records, SPF and DMARC for any domain.
The Email Verification endpoint returns data on email syntax, domain MX/A records, and flags for disposable, role-based, and free email addresses. The DNS Lookup endpoint provides DNS records (A, AAAA, MX, etc.), mail authentication checks (SPF, DMARC), and DNSSEC validation status.
Key fields for Email Verification include "syntax_ok," "has_mx," "disposable," and "verdict." For DNS Lookup, important fields are "status," "exists," "dnssec_validated," and "records," which detail various DNS record types.
The response data is structured in JSON format. For Email Verification, it includes a summary of the email's validity and flags. The DNS Lookup response organizes data by record type under the "records" key, detailing each record's data and TTL.
The Email Verification endpoint provides email validity checks, while the DNS Lookup endpoint offers comprehensive DNS records, mail server configurations, and authentication policies like SPF and DMARC.
Users can customize requests by specifying the email address for verification or the domain for DNS lookups. Each endpoint accepts a single email or domain as a parameter, allowing focused queries.
Typical use cases include validating email addresses for marketing campaigns, ensuring deliverability, and checking domain configurations for email security. Businesses can use this data to reduce bounce rates and enhance communication reliability.
No. It checks syntax, looks up the domain's MX/A records over DNS-over-HTTPS and flags disposable, role and free-mail addresses. It cannot confirm that the mailbox itself exists. Addresses are not stored or logged.
Deliverable_domain, risky or invalid, together with the individual flags.
A, AAAA, MX, NS, TXT, CNAME, CAA, SOA, SRV, HTTPS, DS and more for one domain in one call, plus a mail-auth check of MX hosts, SPF and DMARC policy, and the DNSSEC-validated flag.
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.
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.
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.
Please have a look at our Refund Policy: https://zylalabs.com/terms#refund