I had tried with other email account (not hotmail), however, things become more interesting.
The orignal pdf file is cuted by many small files, each file has the same file name and file size(11.4KB).
I guess that would not the problem of the email account, but the problem of the programe.
in reply to Re^7: SMTP auth() command not supported on smtp.live.com
in thread SMTP auth() command not supported on smtp.live.com