changing inline body from text/plain to text/html on the command line

[Rudy Vener <rudy@xxxxxxxxxxxxxxx>]

HI Ll,
I have been looking over the documentation to find out how to
change the body of a message from text/plain to text/inline from the 
command line.


I want to be able to do:

cat html_file | mutt  [options]  user@xxxxxxxxxxxx

and have mutt send it correctly as inline text/html.

This is simple to do in interactive mode, but so far I cannot find a way 
to do it from the command line.  Is it even possible?

Thanks,
Rudy