[Exim-future] "near" future

Hello,

Sorry if this is not a correct place to send ideas
for exim 4.

Our University has a couple of border mail servers managed
by me and many internal mail servers managed by others.

Currently I get files from other managers containing the
list of valid users for their domains and check if the
recipient is correct for these domains with the following
code:

deny message = User unknown
domains = dsearch;/etc/mail/valid_users
local_parts = !/etc/mail/valid_users/$domain

I would like to use these same files for checking the
senders too:

deny message = Sender unknown
sender_domains = dsearch;/etc/mail/valid_users

but there is no equivalent to the third line:

sender_local_parts = !/etc/mail/valid_users/$sender_address_domain

So my first suggestion is this "sender_local_parts"
ACL condition.

Not all managers send me such files, so I would like
to use callout as well. Unfortunately I do not have
enough time to check everything (virus, spam) during
smtp, espacially in case of large emails, so I pass
these letters to anothar MTA on the same server,
e.g. to a virus scanner.
My second question is if it could be possible to
define a router for callouts? I do not want to use
the standard routing mechanism (which is another
MTA on the same server) for callout, but I would
like to contact directly the final destination server.

I hope that these small suggestions are understandable
and not too far from the aim of this email list.

Regards,

Mihaly Toth-Abonyi
Postmaster
University of Szeged
Hungary