le="class or interface in java.io">Serializable</a></dd>
</dl>
<hr>
<br>
<pre>public class <span class="typeNameLabel">MessageCountEvent</span>
extends <a href="../../../jakarta/mail/event/MailEvent.html" title="class in jakarta.mail.event">MailEvent</a></pre>
<div class="block">This class notifies changes in the number of messages in a folder. <p>

 Note that some folder types may only deliver MessageCountEvents at
 certain times or after certain operations.  IMAP in particular will
 only notify the client