---
title: MMSPartContent.MMSCustomHeader
framework: TelephonyMessagingKit
role: symbol
role_heading: Structure
platforms: [iOS 26.0+]
path: telephonymessagingkit/mmspartcontent/mmscustomheader
---

# MMSPartContent.MMSCustomHeader

A structure that defines a custom header as a key-value pair.

## Declaration

```swift
struct MMSCustomHeader
```

## Overview

Overview TelephonyMessagingKit exposes custom headers in case a message needs to include them in an MMS message.

## Topics

### Accessing header properties

- [key](telephonymessagingkit/mmspartcontent/mmscustomheader/key.md)
- [value](telephonymessagingkit/mmspartcontent/mmscustomheader/value.md)

## Relationships

### Conforms To

- [Decodable](swift/decodable.md)
- [Encodable](swift/encodable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Working with custom headers

- [customHeaders](telephonymessagingkit/mmspartcontent/customheaders.md)
- [addCustomHeader(_:)](telephonymessagingkit/mmspartcontent/addcustomheader(_:).md)