Postfix Changing Outgoing IP By Time Interval Using TCP_TABLE And Perl
email, linux, modules, perl, pop3, postfix, programming, sendmail, smtp
Add comments
Nov 152011
Someone asked me if i can make a perl scripts that can change the ip address based on time interval, say he want ip address 1.2.3.4 used within one hour, if done next ip address will be used within next one hour..and so on. when it came to highest number of ip address in array, they will be reset back to the start. first i suggest him to look at the articles i wrote. But then i decide to write Perl script which was made for the purposes mention above.
here we are..
Postfix section:
master.cf
127.0.0.1:2527 inet n n n - 0 spawn
user=nobody argv=/etc/postfix/ip_by_time.pl
ip1 unix - - n - - smtp
-o syslog_name=postfix-ip1
-o smtp_helo_name=smtp1.example.com
-o smtp_bind_address=1.2.3.1
ip2 unix - - n - - smtp
-o syslog_name=postfix-ip2
-o smtp_helo_name=smtp2.example.com
-o smtp_bind_address=1.2.3.2
ip3 unix - - n - - smtp
-o syslog_name=postfix-ip3
-o smtp_helo_name=smtp3.example.com
-o smtp_bind_address=1.2.3.3
ip4 unix - - n - - smtp
-o syslog_name=postfix-ip4
-o smtp_helo_name=smtp4.example.com
-o smtp_bind_address=1.2.3.4
....
....
main.cf
transport_maps = tcp:[127.0.0.1]:2527 127.0.0.1:2527_time_limit = 3600s
Perl section:
#!/usr/bin/perl
use strict;
use warnings;
use Storable;
## interval between ip switchover, one hour for example
my $ip_interval=3600;
my $hashfile="data.hash";
store {}, $hashfile unless -r $hashfile;
my @smtp_array = (
'ip1:',
'ip2:',
'ip3:',
'ip4:',
'ip5:',
'ip6:',
'ip7:',
'ip8:',
'ip9:',
'ip:'
);
# and more ips
#
# Autoflush standard output.
#
select STDOUT; $|++;
while (<>) {
chomp;
my $time_stamp = retrieve($hashfile);
my $now = time();
if (!defined $time_stamp->{'time_diff'}) {
$time_stamp->{'time_diff'} = $now;
$time_stamp->{'ip_index'} = 0;
store $time_stamp, $hashfile;
}
if (/^get\s(.+)$/i) {
if ($now > $time_stamp->{'time_diff'} + $ip_interval) {
if ($time_stamp->{'ip_index'} < scalar(@smtp_array) - 1) {
$time_stamp->{'ip_index'}++;
} else {
$time_stamp->{'ip_index'} = 0;
}
print "200 $smtp_array[$time_stamp->{'ip_index'}]\n";
$time_stamp->{'time_diff'} = $now;
store $time_stamp, $hashfile;
next;
} else {
print "200 $smtp_array[$time_stamp->{'ip_index'}]\n";
next;
}
}
## default response
print "200 smtp:\n";
}
Good luck.
PS: not tested in real environtment
14 Responses to “Postfix Changing Outgoing IP By Time Interval Using TCP_TABLE And Perl”
Comments (14)
Hey can i use this with IEM?
what is IEM?
Postfix Multiple IP & Hostname
Already followed the instruction http://www.linuxmail.info/postfix-multiple-ip-address-smtp-greeting/
I want that each time using 1 SMTP to send email, it just shows the information of 1 IP & 1 host name in the email header. Now I see that it always shows the information of Main IP & Main Hostname.
Detail in https://docs.google.com/document/d/1aCk7vvbP341FR2kd4zXqDVkZlE_8DArUrT6wlOZoiH0/edit
Thank you so much!
try put header_checks in your main.cf to discard certain information
/etc/postfix/header_checks
Thank you. But I want to use SMTP with IP 184.172.219.242 (s22.vangxa1.com) & remove the main IP information 173.193.98.197 (s27.vangxa1.com). How to make it show the information s22.vangxa1.com only?
Thank you.
But I want to use SMTP with IP 184.172.219.242 (s22.vangxa1.com) & remove the main IP information 173.193.98.197 (s27.vangxa1.com). How to make it show the information 184.172.219.242 (s22.vangxa1.com) only?
Hello
I configured follow your instruction. Outgoing mail is ok. But incoming mail, I receive error: “mail for example.com loops back to myself”
If I use “transport_maps = hash:/etc/postfix/transport” there is no error there.
Can you fix it??
there’s a quick workaround on comment section regarding “mail for example.com loops back to myself” error. example.com has to be in exception.
example.com is just an example of mydomain.com.
Our server use zpanel as control panel, I tried too many way but it still can’t receive mail.
Please help me.
as i said, you need to exclude your local/virtual domain in order not to get affected by the script. says, your domain is example.com and your maildir is virtual:
while (<>) { chomp; my $time_stamp = retrieve($hashfile); my $now = time(); if (!defined $time_stamp->{'time_diff'}) { $time_stamp->{'time_diff'} = $now; $time_stamp->{'ip_index'} = 0; store $time_stamp, $hashfile; } if (/^get\s(.+)$/i) { my $local_domain = $1; $local_domain =~ s/.*\@//i; if ($local_domain eq "example.com") { print "200 virtual:\n"; next; } else { if ($now > $time_stamp->{'time_diff'} + $ip_interval) { if ($time_stamp->{'ip_index'} < scalar(@smtp_array) - 1) { $time_stamp->{'ip_index'}++; } else { $time_stamp->{'ip_index'} = 0; } print "200 $smtp_array[$time_stamp->{'ip_index'}]\n"; $time_stamp->{'time_diff'} = $now; store $time_stamp, $hashfile; next; } else { print "200 $smtp_array[$time_stamp->{'ip_index'}]\n"; next; } } } ## default response print "200 smtp:\n"; }it’s not tested, but i hope you can figure it out
cheer
hi bro, great tutorial but when i send mail, on header just apper per example: mx01.mydomain.com aways! but the ips are rotating.
How can fix the postfix to show received from mx02.mydomain.com ip XX.XX.XX.XX
after received from mx03.mydomain.com and goes like this.
I try to find this out on google but without sucess can you helps me ?
Thanks!
Ronan
i’ve tested on my dev server, there’s nothing wrong. forward amd reverse hostname looks good.
you might want take a look at your dns forward and reverse mapping.
log, relay=gmail-smtp-in.l.google.com[173.194.79.27]:25, delay=153, delays=0/150/1.2/1.9, dsn=2.0.0, status=sent (250 2.0.0 OK 1402382639 er8si1794384pad.81 – gsmtp)
Jun 10 13:43:57 smtp2 postfix-rotate14/smtp[5582]: Host offered STARTTLS: [gmail-smtp-in.l.google.com]
Jun 10 13:43:59 smtp2 postfix-rotate14/smtp[5582]: 3gnhYy3QvCz1GRZM: to=
header;
Received: from smtp14.mydomain.net (smtp14.mydomain.net. [202.xxx.xxx.53])
by mx.google.com with ESMTP id er8si1794384pad.81.2014.06.09.23.43.57
for
Mon, 09 Jun 2014 23:43:58 -0700 (PDT)
# dig -x 202.xxx.xxx.53 +short
smtp14.mydomain.net.
# dig a smtp14.mydomain.net +short
202.xxx.xxx.53
cool man! i buy a new vps today for re setting up everything!
whats the best linux for it?
i try to using zpanel with centos 6 but i cant recompile using tcp tables 🙁
do you recomend some other linux distro for it?
i prefer the zpanel for easily create new mail acounts, webmail etc…
thanks in advance man!
i’m using centos too, have you trying to commented out PreReq line in postfix.spec (/rpmbuild/SPECS/ or /usr/src/redhat/SPECS/ directpry), i know that would break dependencies requirement, just make sure you have chkconfig, initscripts, shadow-utils installed.