Email Verification and DNS Check API

API ID 14519

Verify email addresses and read DNS records, SPF and DMARC for any domain.

API Documentation

Endpoints

Request
Check the email syntax, the domain's MX and A records, and the status of the disposable email addresses. When to use: Use email-verify to check syntax, MX and disposable domains for one address (DNS only, no mailbox probe).
Endpoint ID: 37041
GET https://zylalabs.com/api/14519/email+verification+and+dns+check+api/37041/email+verification
INPUT PARAMETERS

Email Verification — Endpoint Features

Object Description
email Required one email address

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

email
API EXAMPLE RESPONSE
JSON
{
    "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"
        }
    ]
}
Email Verification — CODE SNIPPETS

curl --location --request GET 'https://zylalabs.com/api/14519/email+verification+and+dns+check+api/37041/[email protected]' --header 'Authorization: Bearer YOUR_API_KEY' 


    
Request
DNS lookup over DNS-over-HTTPS (public DNS resolvers, with fallback): A, AAAA, MX, NS, TXT, CNAME, CAA, SOA, SRV, HTTPS, DS... for one domain in one call, plus a mail-auth check (MX hosts, SPF, DMARC policy, warnings) and the DNSSEC-validated flag. When to use: Use dns to read any DNS records of a domain and check its mail setup (MX, SPF, DMARC) in one call. Use email-verify to check a single address.
Endpoint ID: 37042
GET https://zylalabs.com/api/14519/email+verification+and+dns+check+api/37042/dns+lookup
INPUT PARAMETERS

DNS Lookup — Endpoint Features

Object Description
domain Required domain or hostname, e.g. example.com (URLs and emails are trimmed to the host)
types Optional comma list of record types, default A,AAAA,MX,NS,TXT,CNAME,CAA (max 10)
mail Optional false skips the SPF/DMARC check

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

domain
types
mail
API EXAMPLE RESPONSE
JSON
{
    "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)"
        }
    ]
}
DNS Lookup — CODE SNIPPETS

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' 


    

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 Email Verification and DNS Check 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.

Starts at
$10,000/Year


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

Overview

Verify email addresses and read DNS records, SPF and DMARC for any domain.

Email Verification and DNS Check API FAQs

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.

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