Validate Email

Verify email addresses with industry-leading accuracy. Our validation system combines SMTP verification with engagement data for the most reliable results.

Endpoint Details

Pricing
Rate Limits

Metric	Value
Cost	0.25 credits per validation
Calculation	4 validations = 1 credit
Free Results	`unknown` and RFC-invalid results are free

You only pay for definitive SMTP results (valid, invalid). Inconclusive results (unknown) and RFC syntax failures are always free.

RFC 5321/5322 Compliance: Emails that fail RFC syntax validation are automatically marked invalid and returned instantly — no credits charged. This includes malformed addresses, invalid characters, and improper formatting.

Metric	Value
Requests/Minute	300
Burst Capacity	~5 requests/second

Quick Example

curl -X POST 'https://api.leadmagic.io/v1/people/email-validation' \
  -H 'X-API-Key: YOUR_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"email": "john@company.com"}'

Request Parameters

string

required

The email address to validate. Must be a properly formatted email address.

Response

string

required

The validated email address (normalized)

email_status

string

required

Validation result: valid, invalid, or unknown

is_domain_catch_all

boolean

required

Whether the email domain is a catch-all (accepts all addresses)

credits_consumed

number

required

Credits used for this request (0.25 for valid/invalid, 0 for unknown)

message

string

required

Human-readable status message

mx_record

string

Primary MX record for the domain

mx_provider

string

Email provider (Google Workspace, Microsoft 365, etc.)

mx_gateway

string

Security gateway vendor name (null if none)

mx_gateway_type

string

Security gateway type (null if none)

mx_security_gateway

boolean

Whether a security gateway is present

Show Company Enrichment (Included Free)

company_name

string

Company name derived from email domain

company_industry

string

Company industry

company_size

string

Employee count range

company_founded

integer

Year founded

company_type

string

Ownership type (private, public, etc.)

company_linkedin_url

string

LinkedIn company page URL

company_linkedin_id

string

LinkedIn company ID

company_facebook_url

string

Facebook page URL (null if unavailable)

company_twitter_url

string

Twitter/X profile URL (null if unavailable)

company_location

object

Full location with city, state, country, coordinates

Example Response

{
  "email": "jesse@leadmagic.io",
  "email_status": "valid",
  "is_domain_catch_all": false,
  "credits_consumed": 0.25,
  "message": "Email is valid.",
  "mx_record": "aspmx.l.google.com",
  "mx_provider": "Google Workspace",
  "mx_gateway": null,
  "mx_gateway_type": null,
  "mx_security_gateway": false,
  "company_name": "Leadmagic",
  "company_industry": "Internet",
  "company_size": "11-50",
  "company_founded": 2022,
  "company_type": "Private",
  "company_location": {
    "name": "Boston, Massachusetts, United States",
    "locality": "Boston",
    "region": "Massachusetts",
    "metro": "Boston",
    "country": "United States",
    "continent": "North America",
    "street_address": "1 Seaport Lane",
    "address_line_2": null,
    "postal_code": "02210",
    "geo": null
  },
  "company_linkedin_url": "linkedin.com/company/leadmagichq",
  "company_linkedin_id": "75153174",
  "company_facebook_url": null,
  "company_twitter_url": null
}

Status Codes

valid

Safe to email - Bounce rate <1%Email verified by mail server. Costs 0.25 credits.

invalid

Do NOT email - Will bounceMail server confirmed non-existent. Costs 0.25 credits.

unknown

Inconclusive - Could not determine validityCouldn’t reach mail server or domain is unverifiable. FREE (no charge).

RFC Compliance

Emails that don’t comply with RFC 5321/5322 standards are automatically marked invalid — no credits charged:

RFC Violation	Example	Result
Missing `@` symbol	`johncompany.com`	`invalid` (FREE)
Invalid characters	`john@comp any.com`	`invalid` (FREE)
Missing domain	`john@`	`invalid` (FREE)
Double dots	`john..doe@company.com`	`invalid` (FREE)
Invalid TLD	`john@company`	`invalid` (FREE)

RFC validation happens instantly before SMTP verification. Malformed emails are rejected immediately at no cost — reserved credits are rolled back.

Success Messages

Message	Status	Cost
`Email is valid.`	`valid`	0.25
`Email is invalid.`	`invalid`	0.25
`Email is invalid (RFC non-compliant format).`	`invalid`	FREE
`Email is invalid (malformed address).`	`invalid`	FREE
`Unable to determine email validity.`	`unknown`	FREE

Best Practices

Pre-validate format client-side

Run basic regex validation before API calls to catch obvious RFC violations. While RFC failures are free, client-side checks reduce unnecessary API calls.

// Basic RFC-compliant check before API call
const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
if (!emailRegex.test(email)) {
  // Skip API call - obviously invalid
  return { email_status: 'invalid', reason: 'malformed' };
}

Note: Our API catches all RFC violations, but client-side pre-validation can reduce unnecessary API calls.

Validate before sending campaigns

Always validate your email list before sending to maintain high deliverability and protect your sender reputation. Invalid emails hurt your domain reputation.

Handle unknown results

For unknown results, consider retrying later or using Email Finder to verify the specific address exists before adding to campaigns.

Batch your validations

For large lists, batch your requests to stay within rate limits. Use the response headers to monitor your remaining quota.

const remaining = response.headers.get('RateLimit-Remaining');
if (remaining < 100) {
  await sleep(1000); // Slow down if approaching limit
}

Use response headers for monitoring

Every response includes X-Credits-Remaining so you can track spending without extra API calls.

Use Cases

List Cleaning

Validate email lists before campaigns to reduce bounces and protect sender reputation.

Form Validation

Validate emails at point of capture to ensure data quality from the start.

CRM Hygiene

Regularly validate CRM contacts to maintain deliverability rates.

Lead Scoring

Use validation status as a lead quality signal in your scoring models.

Authorizations

X-API-Key

string

header

required

Your LeadMagic API key. Header name is case-insensitive (X-API-Key, X-API-KEY, x-api-key all work).

Body

application/json

string<email>

required

Email address to validate

Example:

"jesse@leadmagic.io"

Response

Successful validation

string

Example:

"jesse@leadmagic.io"

email_status

string

Example:

"valid"

is_domain_catch_all

boolean

Whether the email domain is a catch-all (accepts all addresses)

Example:

false

credits_consumed

number

Example:

0.25

message

string

Example:

"Email is valid."

mx_record

string

Example:

"aspmx.l.google.com"

mx_provider

string

Example:

"Google Workspace"

mx_gateway

string | null

Security gateway vendor name

Example:

null

mx_gateway_type

string | null

Security gateway type

Example:

null

mx_security_gateway

boolean

Example:

false

company_name

string

Example:

"Leadmagic"

company_industry

string

Example:

"Internet"

company_size

string

Example:

"11-50"

company_founded

integer

Example:

2022

company_type

string

Example:

"Private"

company_location

object

Show child attributes

company_linkedin_url

string

Example:

"linkedin.com/company/leadmagichq"

company_linkedin_id

string

Example:

"75153174"

company_facebook_url

string | null

Example:

null

company_twitter_url

string | null

Example:

null

Get Started

API Endpoints

MCP Server

CLI

Email Validation

Validate Email

Endpoint Details

Per-Endpoint Limit

Quick Example

Request Parameters

Response

Example Response

Status Codes

valid

invalid

unknown

RFC Compliance

Success Messages

Best Practices

Use Cases

List Cleaning

Form Validation

CRM Hygiene

Lead Scoring

Authorizations

Body

Response

Get Started

API Endpoints

MCP Server

CLI

​Validate Email

​Endpoint Details

​Per-Endpoint Limit

​Quick Example

​Request Parameters

​Response

​Example Response

​Status Codes

valid

invalid

unknown

​RFC Compliance

​Success Messages

​Best Practices

​Use Cases

List Cleaning

Form Validation

CRM Hygiene

Lead Scoring

Authorizations

Body

Response

Validate Email

Endpoint Details

Per-Endpoint Limit

Quick Example

Request Parameters

Response

Example Response

Status Codes

RFC Compliance

Success Messages

Best Practices

Use Cases