---
title: "HEADERMAPPER activity"
slug: "bc-headermapper-activity"
tags: ["BC", "BIS", "Business Central", "Business Integration Solutions", "Concept", "Task"]
updated: 2026-06-25T09:59:07Z
published: 2026-06-25T09:59:07Z
canonical: "docs.staedean.com/bc-headermapper-activity"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.staedean.com/llms.txt
> Use this file to discover all available pages before exploring further.

# HEADERMAPPER activity

In Business Integration Solutions, use the **HEADERMAPPER** activity to map the business object to the messaging infrastructure.

## Usage

Use this activity to map a source document to the headers of an endpoint, such as SMTP Writer or Outlook Writer.

## Concept

The **Header Mapper** maps settings used in an endpoint or activity that supports dynamic settings. For example, the SMTP and Outlook messaging infrastructure require header configuration such as recipient information (To, CC, BCC), sender information (From), and subject.

The **Header Mapper** activity accesses one or more source documents and converts them into a message as required by the endpoint.

To work with the activity, select the endpoint for which you want to configure the headers. Specify the source document before you configure the message header values. You can map fields to your source document; for example, `Field("Customer/Email")`; or add a constant value; for example, `"info@cronusinternational.com"`; or a combination of both.

XML input ➡️ [Header Mapper] ➡️ Message header (Outlook, SMTP, others)

## Related

- [Set up the Header Mapper activity](/bc-set-up-the-header-mapper-activity.md)