Email validations

Validate one address

Changed on Sep 30, 2026

Syntax, MX, disposable, role and free-provider checks. Results are cached per address.

post/email-validations

Request

Base URL
https://api.poststack.dev
Auth
- HTTP bearer
- or OAuth 2
  Authorization codehttps://poststack.dev/oauth/authorize
  Token URLhttps://poststack.dev/oauth/token
TypeScript
https://skmtc.dev/poststack/apis/poststack-api/docs/email-validations/post.ts
A function with typed inputs. Its response is checked against the schema.

Request body

emailstring email required

Response

Validation result.

emailstring required

result'deliverable' | 'undeliverable' | 'risky' | 'unknown' required

risk'low' | 'medium' | 'high' required

Changes

Sep 30, 20264dc1e20989c8 Revision changes
- warning
  added the new daily_limit_exceeded enum value to the //// response property for the response status
- warning
  added the new daily_limit_exceeded enum value to the response property for the response status
- warning
  added the new daily_limit_exceeded enum value to the response property for the response status
- warning
  added the new daily_limit_exceeded enum value to the response property for the response status
- warning
  added the new monthly_limit_exceeded enum value to the //// response property for the response status
- warning
  added the new monthly_limit_exceeded enum value to the response property for the response status
- warning
  added the new monthly_limit_exceeded enum value to the response property for the response status
- warning
  added the new monthly_limit_exceeded enum value to the response property for the response status
- warning
  added the new send_limit_exceeded enum value to the //// response property for the response status
- warning
  added the new send_limit_exceeded enum value to the response property for the response status
- warning
  added the new send_limit_exceeded enum value to the response property for the response status
- warning
  added the new send_limit_exceeded enum value to the response property for the response status
Sep 29, 2026ef5b22b98333 Revision changes
- warning
  the request property's maxLength was set to 320
- warning
  removed the optional property from the response with the status
- info
  added the non-success response with the status
- info
  added the non-success response with the status
- info
  added the non-success response with the status
- info
  added the non-success response with the status
- info
  added the required property to the response with the status
- info
  added the required property to the response with the status
- info
  added the required property to the response with the status
- info
  added the required property to the response with the status

Operation history

Validate one address

Request

Request body

Response 200OK

Changes

Response