public void setMessageId(String messageId) {
        this.messageId = messageId;
    }
<p>
The unique message identifier returned from the <code>SendRawEmail</code> action.
</p>

@param messageId
       The unique message identifier returned from the <code>SendRawEmail</code> action.
aws-java-sdk-ses/src/main/java/com/amazonaws/services/simpleemail/model/SendRawEmailResult.java