# Add header action
<a name="receiving-email-action-add-header"></a>

The **Add Header** action adds a custom header to the received email. You typically use this action only in combination with another action. This action has the following options.
+ **Header name—**The name of the header to add. It must be between 1 and 50 characters, inclusive, and consist of alphanumeric (a-z, A-Z, 0-9) characters and dashes only.
+ **Header value—**The value of the header to add. It must be less than 2048 characters, and must not contain newline characters ("\$1r" or "\$1n").