Net::Server::Mail::LMTP(3) A module to implement the LMTP protocol


use Net::Server::Mail::LMTP;
my @local_domains = qw(;
my $server = IO::Socket::INET->new( Listen => 1, LocalPort => 25 );
my $conn;
while($conn = $server->accept)
my $esmtp = Net::Server::Mail::LMTP->new( socket => $conn );
# adding some handlers
$esmtp->set_callback(RCPT => \&validate_recipient);
$esmtp->set_callback(DATA => \&queue_message);
sub validate_recipient
my($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");
sub queue_message
my($session, $data) = @_;
my $sender = $session->get_sender();
my @recipients = $session->get_recipients();
return(0, 554, 'Error: no valid recipients')
my $msgid = add_queue($sender, \@recipients, $data)
or return(0);
return(1, 250, "message queued $msgid");


This class implement the LMTP (RFC 2033) protocol.

This class inherit from Net::Server::Mail::ESMTP. Please see Net::Server::Mail::ESMTP for documentation of common methods.


Descriptions of callback who's can be used with set_callback method. All handle takes the Net::Server::Mail::ESMTP object as first argument and specific callback's arguments.


Same as ESMTP EHLO, please see Net::Server::Mail::ESMTP.


Overide the default DATA event by a per recipient response. It will be called for each recipients with data (in a scalar reference) as first argument followed by the current recipient.


Olivier Poitrey <[email protected]>


Available on CPAN.

anonymous Git repository:

git clone git://

Git repository on the web:



Please use CPAN system to report a bug (


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 (C) 2002 - Olivier Poitrey, 2007 - Xavier Guimard