Commons Email aims to provide a API for sending email. It is built on top of
 the Java Mail API, which it aims to simplify.
 .
 Some of the mail classes that are provided are as follows:
 .
  * SimpleEmail - This class is used to send basic text based emails.
  * MultiPartEmail - This class is used to send multipart messages. This allows
     a text message with attachments either inline or attached.
  * HtmlEmail - This class is used to send HTML formatted emails. It has all of
     the capabilities as MultiPartEmail allowing attachments to be easily added.
     It also supports embedded images.
  * ImageHtmlEmail - This class is used to send HTML formatted emails with
     inline images. It has all of the capabilities as HtmlEmail but transform
     all image references to inline images.
  * EmailAttachment - This is a simple container class to allow for easy
     handling of attachments. It is for use with instances of MultiPartEmail and
     HtmlEmail.