To test this out, I signed up for Orange Email and collected a test email sent from the site.
Whilst viewing the email itself, the links to just about every button do change like my OP says.
Bug present in Chrome 9.0.597.107 - just about every button is affected.
Also present in FireFox 3.6.15 although not as widespread, only a few of the screen buttons within the email (IMAP?) screen are changing to "mydomain/#"
Before the email message is clicked on. Everything is normal at this stage...
Now, when the email message is opened, the screen links change to domain/#
Any ideas? Other than "© Orange 2006" as you can see at the base of the screen.
Seems a bit old to me?