Sending HTML mail through mutt

Why would you want to do such a crazy thing? Well, I like the ability to blog by just sending a mail through mutt and sometimes it's convenient to throw in a link or two. I tried various tricks, including setting a send-hook like this in my .muttrc like this:

send-hook '~t <blog_addr>@blogger.com'           'set content_type="text/html"' 

But nothing seems to work. I have to set the content-type manually by typing "^T" in the Compose menu :-(.