---
title: "Look up an ESP-suppressed address"
method: GET
path: "/v1/esp/search_suppression/{email_address}"
tags: ["ESP Suppression"]
---

# Look up an ESP-suppressed address

`GET /v1/esp/search_suppression/{email_address}`

Look up an email address to learn if, and why, it was suppressed by the email service provider (ESP).

## Response `200`

Returns an array of suppressed email addresses.

- EspSuppression
  - `category` 'bounces' | 'spam' — The reason the addresses are suppressed.
  - `suppressions` object[] — The addresses suppressed in this category.
    - `created` integer — The timestamp (in seconds), when the ESP suppressed the address.
    - `email` string — The email address that the ESP suppressed.
    - `reason` string — The reason for the suppression, as [recorded by Mailgun](https://documentation.mailgun.com/en/latest/api-suppressions.html).
    - `status` string — The status code for the suppression, as [recorded by mailgun](https://documentation.mailgun.com/en/latest/api-suppressions.html). This is normally `550`.

## Other responses

- `429` — Your request is over the 10-per-second limit. `Retry-After` tells you how many seconds you must wait before you send the next request.

## Changes

- **2026-09-02** `5da2740beeb5` — 1 info
  - added the media type `application/json` for the response with the status `429`

[Change history](https://skmtc.dev/customer/apis/customer-io-journeys-api-reference/changes/v1/esp/search_suppression/:email_address/get.md)

---

[API](https://skmtc.dev/customer/apis/customer-io-journeys-api-reference.md) · [All operations](https://skmtc.dev/customer/apis/customer-io-journeys-api-reference/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/customer/customer-io-journeys-api-reference/revisions/00b93971a49f/schema)