---
title: "Suppress an address"
method: POST
path: "/api/v1/suppressions"
tags: ["Suppression"]
---

# Suppress an address

`POST /api/v1/suppressions`

## Request

- Base URL: `https://api.sendly.now`
- URL: `https://api.sendly.now/api/v1/suppressions`
- Auth: one of:
  - HTTP bearer
  - API key in cookie `better-auth.session_token`
  - OAuth 2 (authorization code, authorization URL `https://app.sendly.now/api/auth/oauth2/authorize`, token URL `https://app.sendly.now/api/auth/oauth2/token`, scopes: `suppression:write`)

Add an address to this project's suppression list, so no further send reaches it.

Idempotent: suppressing an already-suppressed address answers `201` with the EXISTING record rather than `409`. The first `reason` and `source` win, because a later manual entry must not overwrite what an SES bounce recorded.

`source` is NOT accepted in the body — it is derived from the credential (`API` for an API key, `DASHBOARD` for a session), so a record's provenance cannot be dressed up as a deliverability fact.

Requires the `suppression:write` scope — Add and remove addresses on your suppression list.

## Request body

- SuppressionV1Create: Body for POST /api/v1/suppressions.
  - `email` string, email, required
  - `reason` 'HARD_BOUNCE' | 'COMPLAINT' | 'MANUAL' | 'UNSUBSCRIBE'

## Response `201`

The suppressed address

- SuppressionV1: A suppressed address as exposed on the v1 API.
  - `created_at` string, date-time, required
  - `email` string, required
  - `reason` 'HARD_BOUNCE' | 'COMPLAINT' | 'MANUAL' | 'UNSUBSCRIBE', required
  - `source` string, required

## Other responses

- `401`: `invalid_api_key` or `invalid_session` — missing or invalid credentials.
- `403`: `scope_missing`, `project_access_denied`, or `project_disabled`.
- `422`: `validation_error` — query, path, or body parameters did not match the schema.
- `429`: `rate_limited` — see `Retry-After` and the `RateLimit` headers.
- `500`: `internal_error`.

---

[API](https://skmtc.dev/sendly/apis/sendly-api.md) · [All operations](https://skmtc.dev/sendly/apis/sendly-api/llms.txt) · [OpenAPI document](https://skmtc.dev/sendly/apis/sendly-api/revisions/ce7cfb7f7c7e?raw)