Just try the following.. i think that should help.
Enter this in the main.cf
transport_maps = regexp:/etc/postfix/transport.regexp
transport.regexp should have the following content.
if !/@locally.handled.domain.com$
/
/^[a-f]/ smtp1:
/^[g-j]/ smtp2:
/^[l-q]/ smtp3:
/^[r-w]/ smtp4:
/^[x-z0-9]/ smtp5:
endif
Alternatively you can also use a transport randomizer script which is as
below
#!/usr/bin/perl
my $port = 2525;
my $max_servers = 100;
my $spooldir = "/tmp";
my $user = "nobody";
my $group = "nogroup";
my $background = "1";
my $bindhost = "127.0.0.1";
package Grinch;
use strict;
use vars qw(@ISA);
use Net::Server::PreForkSimple;
use Sys::Syslog;
my $version = "0.9";
my $syslog_ident = "grinch";
my $syslog_logopt = "pid";
my $syslog_facility = "mail";
@ISA = qw(Net::Server::PreForkSimple);
my $pidfile = "$spooldir/pid.log";
sub grinchlog {
syslog("info", shift);
}
sub process_request {
my $mode;
for (;($mode ne "once") && defined (my $cmd = <STDIN>);
$mode = shift unless defined ($mode)) {
my ($host) = $cmd =~ /^get ([a-z0-9\-\...@]+)/i;
if ($host eq "*") {
# we need to ignore the * query
print "500 Blissfully ignoring asterisk!\n";
# grinchlog("ignoring *");
next;
}
if ($host =~ /((mail\.)?productionunit\.info|localhost)$/) {
# we need to ignore queries involving our domains
print "500 Blissfully ignoring our domains!\n";
grinchlog("ignoring our domains");
next;
}
my $random_number = int(rand(19)) + 1;
# Returns a range of 1...5
print "200 smtp$random_number:\n";
grinchlog("$host -> smtp$random_number:");
next;
}
}
my $mode = $ARGV[0];
openlog($syslog_ident, $syslog_logopt, $syslog_facility);
if($mode eq "stop") {
open (PID, "$pidfile");
my $pid = <PID>;
close(PID);
kill 15, $pid;
unlink ($pidfile);
} elsif ($mode eq "lookup") {
process_request ("once");
} elsif (($mode eq "start") || ($mode eq "")) {
# daemon mode, start it
Grinch->run(port => $port,
user => $user,
group => $group,
host => $bindhost,
max_servers => $max_servers,
background => $background,
pid_file => $pidfile,
log_file => "Sys::Syslog",
syslog_ident => $syslog_ident,
syslog_logopt => $syslog_logopt,
syslog_facility => $syslog_facility);
} else {
print STDERR "unknown commandline option: $mode\n";
}
closelog();
Which will run on a libnet server which will randomize the SMTP servers.
Please note that you also need to mention the SMTP in the master.cf as
follows
smtp unix - - - - - smtp
-o smtp_bind_address=
to
smtp1 unix - - - - - smtp
-o smtp_bind_address=
On Tue, Nov 10, 2009 at 21:12, Stan Hoeppner <[email protected]> wrote:
> Marc Silver put forth on 11/10/2009 2:23 AM:
> > Hi,
> >
> > On Tue, 10 Nov 2009 09:03:56 +0200, Jack Knowlton <[email protected]>
> > wrote:
> >> Is it possible to have a transport map with a regular expression? What I
> >> want is to use an external relay server for all the emails to be
> >> delivered
> >> on Yahoo domains (eg, yahoo.com, yahoo.co.uk, yahoo.es, ecc).
> >> If it is possible, how can I implement this?
> >
> > I'm not an expert, but I believe this is possible by specifying your
> > transport file as "transport_maps=regexp:/etc/postfix/transport". You
> > may also use PCRE instead of regexp if you prefer. The only downside is
> > that the entire file needs to be set up in the regex/pcre fashion (as
> > far as I'm aware anyway).
>
> There is no downside, except the possible need for multiple transport
> maps. He can have as many as he wants/needs, of all kinds, hash, pcre,
> regexp, dbm, etc:
>
>
> http://www.postfix.org/postconf.5.html
>
> transport_maps (default: empty)
>
> Optional lookup tables with mappings from recipient address to
> (message delivery transport, next-hop destination). See transport(5) for
> details.
>
> Specify zero or more "type:table" lookup tables. If you use this
> feature with local files, run "postmap /etc/postfix/transport" after
> making a change.
>
> For safety reasons, as of Postfix 2.3 this feature does not allow
> $number substitutions in regular expression maps.
>
> Examples:
>
> transport_maps = dbm:/etc/postfix/transport
> transport_maps = hash:/etc/postfix/transport
>
>
> Instructions above tell us to use postmap on the file after any changes.
> I think that assumes one is using hash, not any other maps types.
> Check the use cases for postmap, as you dont use it on regexp or pcre
> maps, but do use it on hash maps. I'm not sure WRT dbm maps as I've
> never used them.
>
> --
> Stan
>
