patch
https://app.mailivery.io/api/v1/bulk-action/updateSignature
Create or update signatures for multiple mailboxes in a single request.
Use this endpoint for:
- Initial signature setup for many new mailboxes.
- Company-wide rebrands or address changes.
- Synchronizing signature data from external systems (CRM, HRIS).
Each mailbox can have different signature details in the same batch.
Empty request or validation error
API access not found or unauthorized
Team not found or not accessible
No accessible campaigns found for provided IDs
Bulk signature update failed due to server error