[exim] User filters and headers

Hi All,

Since "headers add" is not available to a user filter, is there any way
i could add a custom header to a message that has been filtered by a
users filter,
without piping it to an external program to do the header addition?
We are using the deliver function in the user filter but wish to add a
custom header which can then be used on the remote side(s)
to do the actual message delivery based upon this newly added header.

Unless someone has another suggestion?


Thanks,
Warren