Hello everybody!

Some MUAs create multiword e-mail headers like "In-Reply-To:" or
"Reply-To:", while others do simply "In-reply-to:" and "Reply-to:".
Rmail fails to fontify the header written in the former way.

Other MUAs split headers in two or more lines like this:
C ontent-Type: text/plain;
        charset=us-ascii
Rmail fails to fontify all lines of such a header as well.
Sendmail.el has the same bug.

I would like to know if this also affects mh.

Please consider following patches.