[exim] Autoreply transport

Do messages sent through the autoreply transport pass through the rcpt
and data acls? I would like to write another header to the message and
set a variable, but it's not happening. If these messages don't pass
through the acls, how can I control routing? I'd rather not use the
auto-submitted header.

I've tried this in the rcpt and data acls:

accept  message = X-Cheetah-Policy: report
      set acl_m1LOCAL = 1
        hosts = :

Here's the transport:

returntosender_transport:
driver = autoreply
text = Your message was not delivered.
from = postmaster@???
to = $sender_address
bcc = cjackson@???
subject = [Policy] Re: $h_subject:

Thanks.
Craig