# example configuration entries for Exim

perl_startup = do '/etc/exim.pl'

# transport
local_delivery_cyrus:
    driver = pipe
    command = "/usr/cyrus/bin/deliver \
      -m ${substr_1:${local_part_suffix}} \
      -- ${perl{makecyrusbox}{${local_part}}{${domain}}}"
    user = cyrus
    group = mail
    return_output
    log_output
    prefix =
    suffix =

# This director matches local user mailboxes.

# director
local_user_cyrus:
    driver = smartuser
    suffix = .*
    suffix_optional = yes
    transport = local_delivery_cyrus


-----------
exim.pl:

sub makecyrusbox {
my $localpart = $_[0];
my $domain = $_[1];
$domain =~ s/\./:/g;
return $localpart."::".$domain;
}