> does anyone have any thoughts on exim configuration for client
> systems?
yes.
> i have our main mail hub converted to exim, but the various
> clients are still using sendmail.
... which is a copy of exim I assume :-)
> i suppose it's not really a big deal, except that we have two systems that
> used to be minor hubs that aren't any longer; they have MX records pointing
> to our real hub rather than to themselves, but some mail still comes in from
> MTAs that ignore the lack of a direct MX record.
Tell there where to go !!
> thus, it appears that i need three configurations -- standard client,
> ex-hub, and hub; hub is finished and working. how do people generally
> set these other types of situations up?
I go one step further ....
On the hubs, run a REAL exim, setuid root and all that, using a config file of
/etc/exim.conf.0 [ compile with CONFIGURE_FILE_USE_EUID=yes ] and have an SMTP
entry in inetd.conf.
On all machines (even the MTAs), install exim as sendmail, setuid to exim (not
root) using /etc/exim.conf to say "send everything to the hub".
On "mail-reject" run a dummy SMTP server which rejects all email [[ all hosts
have MX RRs pointing at that server -- all email should be delivered to the
somain, not to a host ]]
/etc/exim.conf:
log_received_recipients
qualify_domain = cl.cam.ac.uk
local_domains =
exim_path = /usr/lib/sendmail
spool_directory = /usr/exim/spool
freeze_tell_mailmaster
end
smtp: driver = smtp;
end
end
domainlist: driver = domainlist;
route_list = "* cl.cam.ac.uk"
lookuphost: driver = lookuphost,
transport = smtp;
self_mx = send
end
* * F,2h,2m; G,16h,2h,1.5; F,4d,8h
end
#nd of Exim configuration file
rejection script (will need editing to change the messages):
#!/usr/bin/perl
$info = ""; while ($res = pop(@ARGV)) { $info .= " " . $res; }
chop($host = `uname -n`);
chop($date = `date`);
$domain = "cl.cam.ac.uk";
$| = 1;
print "220 $host SMTP email rejecter ready at $date.$info\r\n";
while (<>) {
last if /^quit/i;
if (/^hel[op]/i) { print "250 $host Hello there -- I shall reject all
ma
il you send me\r\n"; }
elsif (/^mail *from:/i) { print "250 I accept any sender address I
shall
reject all email though\r\n"; }
elsif (/^rcpt *to:[ ]*([^\n\r]*)/i) {
$recip = $1;
$domain = $1 if $recip =~ /\@[^.]+\.(.+\.cam\.ac\.uk)/;
print "550 All email should be sent to user@$domain and NOT to
a
specific machine (e.g. $recip)\r\n";
}
elsif (/^vrfy/i || /^expn/i) {
$domain = $1 if /\@[^.]+\.(.+\.cam\.ac\.uk)/;
print "550 All email should be sent to user@$domain and NOT to
a
specific machine\r\n"; }
elsif (/^data/i) { print "503 No recipeints are ever valid\r\n"; }
elsif (/^rset/i | /^noop/i | /^debug/i) { print "250 OK\r\n"; }
else { print "500 Command unrecognized.\r\n"; }
}
print "221 $host closing connection. Goodbye.\r\n";
