user profile "contact the author" problem

Hi there i have a sticky issue,

- the global contact form works for anonymous and registered users.
the admin gets the mail with the name and email address, entered by the user, in the mail body.
example

"Name of sender" (....@mail.com) sent a message using the contact form at http://www.mysite.com/contact/mail.

- the user contact form is almost ok , sending works not quite the way i would hope:
you get the folowing body mail

"Recipients name",

(http://www.mysite.com/user/0) has sent you a message via your
contact form (http://www.mysite.be/users/recipient/contact) at
mysite.com .

If you don't want to receive such e-mails, you can change your settings at
http://www.mysite.com/users/recipient.

Message:

bla bla bla this is a test message

You can see this differs from the global form message as the name and mail address aren't send :

It uses /user/0 and no name => no way you can reply to the sender unless he enters his details in the message body.

I looked at the code for the global and user mails (in the core contact module) but i don't know what causes this difference.

Can someone please help me in making the user mails the same style as the global mails?
My site has already gone live and this is a big issue for me.

THX