public void setAddHeader(AddHeaderAction addHeader) {
        this.addHeader = addHeader;
    }
<p>
This action adds a header. This can be used to add arbitrary email headers.
</p>

@param addHeader
       This action adds a header. This can be used to add arbitrary email headers.
aws-java-sdk-mailmanager/src/main/java/com/amazonaws/services/mailmanager/model/RuleAction.java