Default workflow (called "activation") - has several bugs that prevents e-mail notifications to work (just uncommenting blocks bellow "uncomment if you like to use an email notification " is not sufficient):

1. <process-definition name="to-publisher"> is never called from main <process-definition name="activation" revision="j0.0.2">
therefore notification may not be send.

fix - replace:
<!-- go to publisher first -->
<participant ref="group-publisher"/>
with:
<!-- go to publisher first -->
<to-publisher/>

2. mailTemplate references non-existing "testTemplate" - there is no such template in default Magnolia 3.0.2 EE instalation. Attempt to use it results in error:

ERROR 04.04.2007 17:08:31 Could not send email:Template:[testMagnolia] configuration was not found in repository

Possible workaround - use

<set field="mailTemplate" value="testFreemarker"/>

2b) Not a bug, but rather consequence: testFreemarker requires mandatory parameter user

ERROR 05.04.2007 09:51:38 Could not send email:Expression user is undefined on line 1, column 7 in testFreemarker.html.

I added this to temporarily fix it:

<set field="user" value="dont crash freeMarker"/>

Note: This workaround is related to using testFreeMarker template only. It should be better
to include proper mail template in Magnolia installation.

3) MgnlMailFactory. convertEmailList() ignores groups (here "group-publisher") - so sending mail crashes with

ERROR 05.04.2007 10:21:45 Could not send email:No recipient addresses

Thus bug http://jira.magnolia.info/browse/MAGNOLIA-1230 is blocking e-mail notifications