Email

Validate an email address's deliverability

Checks email format, then resolves the domain's DNS to confirm it exists and has MX records, and flags reserved/disposable/free-provider domains. Use this before sending outreach to filter out addresses that cannot receive mail. Rate limit: 20 requests/minute per IP.

post/api/v1/email/validate

Request

  • Base URL: https://firstsales.io
  • URL: https://firstsales.io/api/v1/email/validate
  • Auth: none required

Request body

emailstring email required

Response

Validation result (still 200 even when the email is invalid — check valid).

validboolean required
domainstring required
domainExistsboolean required
hasMxboolean required
isReservedboolean required
isDisposableboolean required
isFreeProviderboolean required
errorstring
messagestring

Changes

No recorded changes to this operation across all 1 revision of this API.