I just succesfully followed the learning activity of email modules depicted in article.
During the study I updated also the examples at version 1.50 (not easy job)

// Here attached the result of my job.
code is in index post that resumes all my post about this activity (thanks to Elemental for more space)

In the structure of my working installation zend library is under the root
and the modules are in root\understanding_zend ( as per zip ).

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il rosso