public void setMessageId(String messageId) {
        this.messageId = messageId;
    }
<p>
The identifier of the email message to retrieve.
</p>

@param messageId
       The identifier of the email message to retrieve.
aws-java-sdk-workmailmessageflow/src/main/java/com/amazonaws/services/workmailmessageflow/model/GetRawMessageContentRequest.java