Bug 12364

When you want to attach multiple files to a mail, the number of attachments 
(size of the bodyparts collection) is respected but only the last filename of 
the collection is always attached.

So if you have 5 attachments, you will have 5 times the last filename attached.

This is the cause of the problem in the AttachTag class:

MimeBodyPart mbp = new MimeBodyPart();

must be changed in:

MimeBodyPart mbp = null;

and in the doAfterBody() method you must make a new isntance of this object at 
each time the function is called, namely:

mbp = new MimeBodyPart();

Otherwise if this isn't done that way, the different items of the bodyparts 
collection will always point at one point of the memory where a MimeBodyPart is 
stored (basic Java knowledge, like pointers in C++)