Email Validation API

Validate email addresses before signup, lead capture, CRM imports, and outbound workflows. The API checks syntax, normalizes the address, identifies role accounts, detects disposable domains, checks MX records, and can optionally attempt SMTP mailbox verification.

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Endpoint

POST /v1/dev/email/validate
POST /v1/utility/email/validate

Request body

Field	Type	Required	Description
`email`	`string`	Yes	Email address to validate.
`check_smtp`	`boolean`	No	Attempt SMTP mailbox verification. Defaults to `false`; slower and not always reliable.

Example request

curl --request POST \
  --url https://apimask-developer-utilities-api.p.rapidapi.com/v1/dev/email/validate \
  --header "Content-Type: application/json" \
  --header "X-RapidAPI-Key: $RAPIDAPI_KEY" \
  --header "X-RapidAPI-Host: apimask-developer-utilities-api.p.rapidapi.com" \
  --data '{"email":"hello@example.com","check_smtp":false}'

Example response

{
  "success": true,
  "data": {
    "is_valid": true,
    "email": "hello@example.com",
    "local_part": "hello",
    "domain": "example.com",
    "is_disposable": false,
    "has_mx_records": true,
    "smtp_verified": false,
    "is_role_account": false,
    "reason": null
  },
  "error": null,
  "meta": {}
}

Response fields

Field	Type	Description
`is_valid`	`boolean`	Whether the email is syntactically and structurally valid.
`email`	`string` or `null`	Normalized email address if valid.
`local_part`	`string` or `null`	Portion before `@`.
`domain`	`string` or `null`	Portion after `@`.
`is_disposable`	`boolean`	Whether the domain is a known disposable email provider.
`has_mx_records`	`boolean`	Whether the domain has MX records.
`smtp_verified`	`boolean`	Whether SMTP mailbox verification succeeded.
`is_role_account`	`boolean`	Whether the address is a role account like `support@` or `info@`.
`reason`	`string` or `null`	Invalid reason when available.

Email & Domain Regex Generator