[exim] Finally, Rejecting Based On BATV

Thanks to all who have helped. I have been correctly signing the
envelope sender for seven days. Now I would like to start rejecting
messages with bad or missing BATV signatures.

I've seen a little discussion on the list and in the archives, but not
enough of a full recipe for me to implement the rejections as I wish. I
believe I need two separate ACL statements.

First, at RCPT time I want to allow empty senders to unsigned addresses,
as to not deny callouts. But I do want to deny old or invalid
signatures. Actually if I could reject bad BATV signed addresses from
any sender, not just empty, that would be even better.

Second, at DATA time I then want to deny any message from a null sender
that does not have a BATV signed recipient.

Thanks again,
Chris