URL missing in header when printing email

Hi,
I'm not sure if this is the appropriate newsgroup to post to, but I'll 
have a go anyway.
When printing an email with mozilla =< 1.3.1, I used to get a header 
with the title of the email and the URL of the email (like 
mailbox:///blablah/blah/whatever)
But mozilla 1.4 and higher won't show this URL anymore.
when printing a webpage, the url is printed in the header, just not when
printing email.
is this a bug or a feature, and more important, can I get the old 
behaviour back ?

TIA
roger