Comment 5 for bug 119441

This is a huge problem when using ThunderBird in a enterprise environment.

You must be able to determine the recepients of the original message from the
reply header.

In my case, it's against the policy of the IT department to modify and/or
delete the reply headers of the original message. But with ThunderBird the
headers are not included in the first place. So, I can't use it at work.