---
title: SplitMailingWebservice
slug: campaign/docs/splitmailingwebservice
docTags: 
createdAt: 2026-07-02T19:01:44.226Z
---

To create mailings to be used as splits, use the [MailIdWebservice](docId\:nrghOv9wEIlJ_r41HkUP-)  methods.

| Method                          | Description                                                                                          |
| ------------------------------- | ---------------------------------------------------------------------------------------------------- |
| addSplit                        | Converts an existing mailing into a split mailing and assigns this mailing to a master mailing.      |
| getSplitChildIds                | Queries the IDs of all split mailings which are assigned to a specific master mailing.               |
| getSplitMasterId                | Queries the ID of the master mailing, which is associated with a specific split mailing.             |
| removeSplit                     | Converts a split mailing into a regular mailing.                                                     |
| setFinalSplitSelectionCriterion | Defines the selection criterion for sending a split mailing as master mailing.                       |
| setMasterStartDelay             | Defines the sending delay for the start of a master mailing after all split mailings have been sent. |

## Mailing type

The following mailing type is supported:

- split: A regular split mailing

## MIME type

The following MIME types are supported:

- text/plain: Text emails
- text/html: HTML emails
- multipart/alternative: Text and HTML emails

## Selection criteria

The following selection criteria are supported:

- OPEN\_RATE: Open rate
- BOUNCE\_RATE: Bounce rate
- CLICK\_RATE: Click rate
- EFFECTIVE\_CLICK\_RATE: Effective click rate
- UNSUBSCRIBE\_RATE: Unsubscribe rate