09-04-2001
Quote:
Originally posted by PxT
It may even be a violation of your ISP's Acceptable Use Policy to insert fake headers -- which probably means you lose your net connection if your ISP finds you doing this more than once. (They know that the only people who _really_ need to do this are spammers...).
However, many people have Linux working at their homes as SMTP (sendmail) servers. We do not send mail through our ISP's server. We buy dial-up accounts just for getting Internet connections. Except for those Windows users, the rest (like Unix guys) prefer sending mails through their own **IX SMTP (sendmail) servers installed in their PCs.
So, mail header modification is now completely our own business and is not a violation of ISP policy.
But things are still hard. The recipients server anyhow knows the IP of the sender server and adds this portion into the email header when it receives a mail. The portion is like following,
--------------------------------------------
Received: from eddie_host.com([200.100.100.200]) by recipients_server.com (JetMail 2.5.3.0) with SMTP id jm03b8b2cb4; Mon, 27 Aug 2001 21:20:50 -0000
--------------------------------------------
What reports the IP of my sendmail server to the recipients server? Sendmail daemon? Does the recipients server resolve the IP form the network packets (Network Layer of OSI)? If we have to change something at the network layer to spoof the IP, I would like to give up.
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LEARN ABOUT DEBIAN
net::smtp::server::relay
Server::Relay(3pm) User Contributed Perl Documentation Server::Relay(3pm)
NAME
Net::SMTP::Server::Relay - A simple relay module for Net::SMTP::Server.
SYNOPSIS
use Carp;
use Net::SMTP::Server;
use Net::SMTP::Server::Client;
use Net::SMTP::Server::Relay;
$server = new Net::SMTP::Server('localhost', 25) ||
croak("Unable to handle client connection: $!
");
while($conn = $server->accept()) {
# We can perform all sorts of checks here for spammers, ACLs,
# and other useful stuff to check on a connection.
# Handle the client's connection and spawn off a new parser.
# This can/should be a fork() or a new thread,
# but for simplicity...
my $client = new Net::SMTP::Server::Client($conn) ||
croak("Unable to handle client connection: $!
");
# Process the client. This command will block until
# the connecting client completes the SMTP transaction.
$client->process || next;
# In this simple server, we're just relaying everything
# to a server. If a real server were implemented, you
# could save email to a file, or perform various other
# actions on it here.
my $relay = new Net::SMTP::Server::Relay($client->{FROM},
$client->{TO},
$client->{MSG});
}
DESCRIPTION
The Net::SMTP::Server::Relay module implements simple SMTP relaying for use with the Net::SMTP::Server module. All this module does is to
take a given message and iterate through the list of recipients, doing DNS lookups for the associated MX record and delivering the
messages. This module makes extensive use of the plethora of other modules already implemented for Perl (specifically the DNS and
Net::SMTP modules in this case), and should give but a glimpse of the potential for extending the Net::SMTP::Server's functionality to
provide a full-featured SMTP server, native to Perl.
The above example illustrates the use of the Net::SMTP::Server::Relay modules -- you simply have to instantiate the module, passing along
the sender, recipients, and message. More formally:
$relay = new Net::SMTP::Server::Relay($from, @to, $msg);
Where $from is the sender, @to is an array containing the list of recipients, and $msg is the message to relay.
AUTHOR AND COPYRIGHT Net::SMTP::Server / SMTP::Server is Copyright(C) 1999, MacGyver (aka Habeeb J. Dihu) <macgyver@tos.net>. ALL RIGHTS
RESERVED.
You may distribute this package under the terms of either the GNU General Public License or the Artistic License, as specified in the Perl
README file.
SEE ALSO
Net::SMTP::Server::Server, Net::SMTP::Server::Client
perl v5.10.1 1999-12-28 Server::Relay(3pm)