maildrop and Delivered-To

[D3s7]

I'm working with a few scripts / applications that require the Delivered-To and Reply-To headers to exist in the Maildir file.

It seems interestingly enough that if maildrop is called from the .qmail file these two headers are removed from the resulting file.

Anyone know if this is maildrop or qmail that's removing or not writing them and more importantly how to make sure they get written..