Attachment handling not functional

[raymondlu31]

It can print msg as string, which includes encoded attachment MIME part, but it cannot parse/separate attachment name and data as expected.

Tested with jpg and pdf files, pdf test case stop with IO error:

Traceback (most recent call last):
File "xxx.py", line 31, in
fileob = open(attachment['name'],'wb')
IOError: [Errno 2] No such file or directory: '\\webreq\WebReqDocs\469f6b6f0571492cb5bf11ffbcc7f7c0636282076179722797.pdf'

The actual attachment file name is "__webreq_WebReqDocs_469f6b6f0571492cb5bf11ffbcc7f7c0636282076179722797.pdf"
It seems got wrong escape.