Pro-commit hook and color diff in email

Hi,

I currently use svnnotify to send colored diff html commit mail from a
post-commit hook.
But I have a problem if UTF-8 characters like German umlauts are in the
commit messages.

They are not shown correctly in the email.

I call svnnotify with the options:

/usr/local/bin/svnnotify --repos-path "$REPOS" --revision "$REV"
--handler HTML::ColorDiff --with-diff --encoding UTF-8 --from xx --to xx

Is this a known bug or has anyone another tool that handles this
characters correctly?

Thanks
Matthias

-- 
"Programming today is a race between software engineers striving to
build bigger and better idiot-proof programs, and the universe trying to
produce bigger and better idiots. So far, the universe is winning." --
Rich Cook