i like send a html body i had tried -attach "my_file.htm,text/html,i" but no show in the body

PLEASE helpme

Most mail readers (e.g. gmail, Thunderbird) respect inline content disposition. Anyway I will add another type to avoid adding filename in the MIME header, it will be something like -attach "file.html,text/plain,b".

I looked at it some more. Unfortunately it will not work with Outlook. Outlook does not respect inline content-disposition MIME header. Please look at the Microsoft Knowledge base article http://support.microsoft.com/kb/814111 for detail. I updated FAQ with the info.