# AddHeaderAction
<a name="API_AddHeaderAction"></a>

The action to add a header to a message. When executed, this action will add the given header to the message.

## Contents
<a name="API_AddHeaderAction_Contents"></a>

 ** HeaderName **   <a name="sesmailmanager-Type-AddHeaderAction-HeaderName"></a>
The name of the header to add to an email. The header must be prefixed with "X-". Headers are added regardless of whether the header name pre-existed in the email.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 64.  
Pattern: `[xX]\-[a-zA-Z0-9\-]+`   
Required: Yes

 ** HeaderValue **   <a name="sesmailmanager-Type-AddHeaderAction-HeaderValue"></a>
The value of the header to add to the email.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 128.  
Required: Yes

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/mailmanager-2023-10-17/AddHeaderAction) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/mailmanager-2023-10-17/AddHeaderAction) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/mailmanager-2023-10-17/AddHeaderAction)