Zend_Mime_Part
Objects can be added to a given Zend_Mime_Message object by
calling addPart($part)
An array with all Zend_Mime_Part
objects in the Zend_Mime_Message is returned from the method
getParts(). The Zend_Mime_Part
objects can then be changed since they are stored in the array as references. If
parts are added to the array or the sequence is changed, the array needs
to be given back to the Zend_Mime_Part
object by calling setParts($partsArray).
The function isMultiPart() will return
TRUE if more than one part is registered with the
Zend_Mime_Message object and thus the object would generate a
Multipart-Mime-Message when generating the actual output.