Mail::SpamAssassin::SMTP::SmartHost - A simple smarthost module for Net::SMTP::Server.


Mail::SpamAssassin::SMTP::SmartHost - A simple smarthost module for Net::SMTP::Server.


  use Carp;
  use Net::SMTP::Server;
  use Net::SMTP::Server::Client;
  use Mail::SpamAssassin::SMTP::SmartHost;
  $server = new Net::SMTP::Server('localhost', 25) ||
    croak("Unable to handle client connection: $!\n");
  while($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: $!\n");
    # 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 $relay = new Mail::SpamAssassin::SMTP::SmartHost($client->{FROM},


The Mail::SpamAssassin::SMTP::SmartHost module implements simple SMTP client connection for use with the Net::SMTP::Server module. All this module does is to take a given message and deliver it into another SMTP server, using it as a ``smarthost'', making it useful for reinjecting filtered content back into an SMTP server via an unfiltered port.

This code started life as the Net::SMTP::Server::Relay module which comes standard with the Net::SMTP::Server package. After some appropriate modifications, it is now useful to connect to an arbitrary SMTP server.

The above example illustrates the use of the Mail::SpamAssassin::SMTP::SmartHost module -- you simply have to instantiate the module, passing along the sender, recipients, message, and next-hop mailserver. More formally:

  $relay = new Mail::SpamAssassin::SMTP::SmartHost($from, @to, $msg, $smarthost);

Where $from is the sender, @to is an array containing the list of recipients, $msg is the message to relay, and $smarthost is the SMTP server to which you wish to connect including port in host:port format.


Orignial code Net::SMTP::Server / SMTP::Server is Copyright(C) 1999, MacGyver (aka Habeeb J. Dihu) <>. ALL RIGHTS RESERVED.

Modifications to Net::SMTP::Server::Relay Ian R. Justman <>

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.


Net::SMTP::Server::Server, Net::SMTP::Server::Client, Net::SMTP::Server::Relay

 Mail::SpamAssassin::SMTP::SmartHost - A simple smarthost module for Net::SMTP::Server.