NAME

       Net::Server::Mail - Class to easily create a mail server

SYNOPSIS

           use Net::Server::Mail::SMTP;

           my @local_domains = qw(example.com example.org);
           my $server = IO::Socket::INET->new( Listen => 1, LocalPort => 25 );

           my $conn;
           while($conn = $server->accept)
           {
               my $smtp = Net::Server::Mail::SMTP->new( socket => $conn );
               $smtp->set_callback(RCPT => \&validate_recipient);
               $smtp->set_callback(DATA => \&queue_message);
               $smtp->process();
               $conn->close();
           }

           sub validate_recipient
           {
               my($session, $recipient) = @_;

               my $domain;
               if($recipient =~ /\@(.*)>\s*$/)
               {
                   $domain = $1;
               }

               if(not defined $domain)
               {
                   return(0, 513, 'Syntax error.');
               }
               elsif(not(grep $domain eq $_, @local_domains))
               {
                   return(0, 554, "$recipient: Recipient address rejected: Relay access denied");
               }

               return(1);
           }

           sub queue_message
           {
               my($session, $data) = @_;

               my $sender = $session->get_sender();
               my @recipients = $session->get_recipients();

               return(0, 554, 'Error: no valid recipients')
                   unless(@recipients);

               my $msgid = add_queue($sender, \@recipients, $data)
                 or return(0);

               return(1, 250, "message queued $msgid");
           }

DESCRIPTION

       This module is a versatile and extensible implementation of the SMTP protocol and its
       different evolutions like ESMTP and LMTP. The event driven object-oriented API makes easy
       to incorporate the SMTP protocol to your programs.

       Other SMTPd implementations don't support useful ESMTP extensions and the LMTP protocol.
       Their interface design precludes adding them later. So I've decided to rewrite a complete
       implementation with extensibility in mind.

       It provides mechanism to easy addition future or not yet implemented ESMTP extensions.
       Developers can hook code at each SMTP session state and change the module's behaviors by
       registering event call-backs. The class is designed to be easily inherited from.

       This class is the base class for mail service protocols such as Net::Server::Mail::SMTP,
       Net::Server::Mail::ESMTP and Net::Server::Mail::LMTP. Refer to the documentation provided
       with each of these modules.

METHODS

   new
           $instance = Net::Server::Mail->new( [option => 'value', ...] )

       options:

       handle_in
           Sets the input handle, from which the server reads data. Defaults to STDIN.

       handle_out
           Sets the output handle, to which the server writes data. Defaults to STDOUT.

       socket
           Sets a socket to be used for server reads and writes instead of handles.

       error_sleep_time
           Number of seconds to wait for before printing an error message. This avoids some DoS
           attacks that attempt to flood the server with bogus commands. A value of 0 turns this
           feature off. Defaults to 0.

       idle_timeout
           Number of seconds a connection must remain idle before it is closed.  A value of 0
           turns this feature off. Defaults to 0.

   dojob
       Some commands need to do a job after the handler call. The handler may want to override
       this to prevent the job from being executed.

       By calling this method with a (defined) false value as an argument, the expected job isn't
       executed. Defaults to true.

   set_callback
         ($success, $code, $msg) = $obj->set_callback(VERB, \&function, $context)>

       Sets the callback code to be called on a particular event. The function should return 1 to
       3 values: (success, [return_code, ["message"]]).

           $mailserver->set_callback
           (
               'RCPT', sub
               {
                   my($address) = @_;
                   if(is_relayed($address))
                   {
                       # default success code/message will be used
                       return 1;
                   }
                   else
                   {
                       return(0, 513, 'Relaying denied.');
                   }
               }
           );

   process
           $mailserver->process;

       Start a new session.

   banner
       Send the introduction banner. You have to call it manually when are using process_once()
       method. Don't use it with process() method.

EVENTS

   banner
       Append at the opening of a new connection.

       Handler takes no argument.

   timeout
       This event append where timeout is exceeded.

       Handler takes no argument.

   timeout
       This event append where connection is closed or an error occurs during reading from
       socket.

       Takes the error description as an argument if an error occurred and the argument is
       undefined if the session was closed by peer.

           $mailserver->set_callback
           (
               'stop_session', sub
               {
                   my($session, $err) = @_;
                   if( defined $err )
                   {
                       print "Error occurred during processing: $err\n";
                   }
                   else
                   {
                       print "Session closed py peer\n";
                   }
                   return 1;
               }
           );

SEE ALSO

       Please, see Net::Server::Mail::SMTP, Net::Server::Mail::ESMTP and Net::Server::Mail::LMTP.

AUTHOR

       Olivier Poitrey <rs@rhapsodyk.net>

AVAILABILITY

       Available on CPAN.

       anonymous Git repository:

       git clone git://github.com/rs/net-server-mail.git

       Git repository on the web:

       <https://github.com/rs/net-server-mail>

BUGS

       Please use CPAN system to report a bug (http://rt.cpan.org/).

LICENCE

       This library is free software; you can redistribute it and/or modify it under the terms of
       the GNU Lesser General Public License as published by the Free Software Foundation; either
       version 2.1 of the License, or (at your option) any later version.

       This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
       without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
       See the GNU Lesser General Public License for more details.

       You should have received a copy of the GNU Lesser General Public License along with this
       library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
       Boston, MA 02111-1307 USA

COPYRIGHT

       Copyright (C) 2002 - Olivier Poitrey
       Copyright (C) 2007-2013 - Xavier Guimard

   STARTTLS
       Copyright (C) 2009 - Dan Moore <dan at moore.cx>
       Copyright (C) 2013 - Mytram <rmytram@gmail.com>
       Copyright (C) 2013 - Xavier Guimard <x.guimard@free.fr>

   Contributors
       2012 - Georg Hoesch (patch to reduce memory consumption)