[Exim] for the WishList: message submission

I would like to be able to tell Exim (e.g. in the DATA ACL) that this
message is being received in submission mode and should have the usual
fix-ups -- adding missing headers etc. It's very hard to implement the
correct logic for From: and Sender: in an ACL. Local submission has the
local_from_check logic, which clearly needs adjusting for submission over
the network -- e.g. using $authenticated_id for the check (which would
also work for local submissions).

I'd like to replace all of

# If a message came from an authorized sender, do some header fix-ups

  warn     message       = Message-ID: <E${message_id}@${primary_hostname}>
           condition     = $acl_m0
           condition     = ${if !def:h_Message-ID: {true} {false} }

  warn     message       = Date: $tod_full
           condition     = $acl_m0
           condition     = ${if !def:h_Date: {true} {false} }

# XXX: We should remove an existing Sender: header in this case.

  warn     message       = Sender: ${authenticated_id}@${extract \
                             {domain}{PARAM} {$value} {$qualify_domain} }
           condition     = ${if def:authenticated_id {true} {false} }
           condition     = ${if !def:h_Sender: {true} {false} }

  warn     message       = From: ${authenticated_id}@${extract \
                             {domain}{PARAM} {$value} {$qualify_domain} }
           condition     = ${if def:authenticated_id {true} {false} }
           condition     = ${if !def:h_From: {true} {false} }

with something like

  accept   condition = $acl_m0
           control = sumbission

($acl_m0 means the sender is authorized, either by IP address, SMTP AUTH,
or TLS certificate)

--
Tony Finch <dot@???> http://dotat.at/