---
title: "Override Email Headers for a HTML Email"
slug: "change-email-header-for-one-sendout"
updated: 2026-02-05T16:00:42Z
published: 2026-02-05T16:00:42Z
---
> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mapp.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Override Email Headers for a HTML Email
## Goal
Modify the email header for a single email sendout.
## Background Information
You can customize email headers during HTML email creation by defining specific parameters. These custom settings override the default options defined in the group sendout settings.
To add CC or BCC headers, you must have the following system permission:
- **Permission 254** – *Messaging: Create CC and BCC Header*
For more information about default header options, see the [Group Management documentation documentation](/v1/docs/group-management).
## Procedure
1. Navigate to **Step 2: Content** in the message creation wizard.
2. Expand the **Advanced Options** section.
3. In the **Email Headers** area, click the **+** symbol to add a new parameter.
4. Enter the header name in the first field.
5. Enter the corresponding value in the second field.
> [!NOTE]
> **Note:** These settings will override the default group-level header configuration.
## Header Modification Guide
| Modification | Header Name | Header Value Example |
| --- | --- | --- |
| Specify a custom "From" address | `From` | `"J Sample" <example@mywebsite.com>` |
| Send a copy (CC) of the message | `X-eC-messenger-CC` | `copy@example.com` (visible to all recipients) |
| Send a blind copy (BCC) | `X-eC-messenger-BCC` | `hidden@example.com` (not visible to recipients) |
> [!NOTE]
> **Warning:** Modifying email headers may affect message deliverability. If unsure, contact your account manager.
> [!NOTE]
> **Note for DMARC Compliance:** Use one of the following formats for the "From" address:
>
> - `Display Name <username@domain>`
> - `<username@domain>`
**Example**:
Deliverability is the ability of an email to reach a recipient’s inbox successfully. It is influenced by factors like sender reputation, authentication, and engagement.