# Stop Sending Email Campaign

POST /api/v2/projects/{projectId}/email-campaigns/{campaignId}/stop

Pauses a campaign that is currently sending. Any in-flight batch is cancelled and the campaign moves to PAUSED, keeping its pagination cursor so Resume Sending Email Campaign can pick up where it stopped. Emails already handed to the provider still go out.

## Request

- projectId: string, path, required — ID of the project that owns the campaign.
- campaignId: string, path, required — ID of the sending campaign to pause.

## Response

- 200: Successful response
  - contactsFilterGroups: object[], required
    - filters: object[], required — Attribute filters combined with groupType.
    - groupType: AND | OR | NOT, required — How filters in this group are combined.
    - oneDayEventFilters: object[] — Event filters evaluated over the last 24 hours only.
    - requireSubscribed: boolean — When true, the group is ANDed with `$subscribed == true`. Set by email sending, not the filter UI.
  - createdAt: string, required
  - id: string, required
  - messages: object[], required
    - bodyHTML: string, required
    - bodyJSON: object, required
    - createdAt: string, required
    - emailCampaignId: string, required
    - fromDomain: string, required
    - fromEmailUsername: string, required
    - fromName: string, required
    - id: string, required
    - label: string, required
    - previewTextHTML: string, required
    - previewTextJSON: object, required
    - projectId: string, required
    - sendCount: integer, required, default 0
    - subjectHTML: string, required
    - subjectJSON: object, required
    - text: string, required
    - theme: object, required
    - updatedAt: string, required
    - bcc: string
    - cc: string
    - lastSuccessContactCreatedAt: string
    - lastSuccessContactId: string
    - replyTo: string
    - scheduledAt: string
    - …
  - name: string, required
  - projectId: string, required
  - sendCount: integer, required, default 0
  - sendPaginationCount: integer, required, default 0
  - status: DRAFT | SCHEDULED | SENDING | SENT | PAUSED | CANCELLED, required
  - type: STANDA
…