Hello sebb, thanks for the speedy and informative reply. 
Before attempting the MonitorHealthVisualizer email alerts pane I decided it 
would be prudent to study the operation of the MailVisualizer Listener.

* Using a Test Plan ThreadGroup known to be running correctly against a known 
installed application I attached a MailVisualizer Listener, filled in the parms 
and pressed the Test Mail button only
to see JMeter hang. 
* JMeter log only shows the output from the sendTestMail() method from class: 
MailerModel. There were no exceptions or error conditions logged.
* Are there known bugs at JMeter using the geronimo-javamail.jar?
* I found no reference to JavaMail, email or MailerModel issues in JMeter 
Bugzilla.
* Further investigation lead me to: 
http://issues.apache.org/jira/browse/GERONIMO-2682 (the Transport.send() in 
geronimo-javamail.jar is an unresolved issue).
* As a temporary solution I assigned an instance of SMTPTransport to a 
Transport variable. This works correctly. 
* I replaced the geronimo-javamail.jar with mail.jar in the build.properties.
* This is not an equitable solution but if I can successfully add the email 
alerts pane to the MonitorHealthVisualizer I will feel more comfortable with 
adding the third pane if it is actually working! 
* In this way the email alerts pane may be useful someday whenever the 
geronimo-javamail.jar issues get resolved.

sebb wrote ..
> On 27/03/2008, David Brown <[EMAIL PROTECTED]> wrote:
> > Hello Sebb, JMeter committers and developers, I have been reading the Mike 
> > Stover
> JMeter plugin PDF and as a result I read the comments at the top of the 
> MailHealthVisualizer
> class:
> 
> s/MailHealthVisualizer/MonitorHealthVisualizer/
> 
> >
> >  /* In the future, we may want to add email alerts as a third tab. */
> >
> >  My questions are:
> >  * Would such an addition be considered a plugin?
> 
> Yes and no. In a sense, almost all of JMeter is plugins. However the
> term is normally reserved for brand new functionality, not
> enhancements to existing classes.
> 
> >  * Has anyone worked on this or planning to work this issue? (I have 
> > searched
> in: https://issues.apache.org/bugzilla/buglist.cgi?quicksearch=jmeter)
> 
> No.
> 
> >  * I have studied the code to some extent and it appears the content of the 
> > MailerVisualizer.java
> Listener could be used as a go-by to create a MonitorMailerPanel.java similar 
> to
> the other panes: MonitorHealthPanel.java and attach the MonitorMailerPanel 
> pane
> to the MailerVisualizer.java along with the other panes?
> 
> Probably.
> 
> >  * If this would not work are there better places in the source to study to 
> > get
> a better understanding of what is required to complete the mail alert issue?
> >
> >  Please advise, David.
> >
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