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Net::LMTP - Local Mail Transfer Protocol Client


    use Net::LMTP;
    # Constructors
    $lmtp = Net::LMTP->new('mailhost', 2003);
    $lmtp = Net::LMTP->new('mailhost', 2003, Timeout => 60);


This module implements a client interface to the LMTP protocol, enabling a perl5 application to talk to LMTP servers. This documentation assumes that you are familiar with the concepts of the LMTP protocol described in RFC2033. This module is based on Net::SMTP and shares more than %95 of its code with Net::SMTP.

A new Net::LMTP object must be created with the new method. Once this has been done, all LMTP commands are accessed through this object.

The Net::LMTP class is a subclass of Net::Cmd and IO::Socket::INET.

Net::LMTP does not yet implement full implementation of the protocol as specified in RFC2033. In particular, handling per-recipient reply codes from the DATA command is not yet implemented. Net::LMTP can still be used to deliver to multiple recipients, but you will not be able to get the DATA reply code for each recipient.


This example prints the mail domain name of the LMTP server known as mailboxhost with LMTP service on port 2003:

    #!/usr/local/bin/perl -w
    use Net::LMTP;
    my $lmtp = Net::LMTP->new('mailboxhost', 2003);
    print $lmtp->domain,"\n";

This example sends a small message to the postmaster at the SMTP server known as mailhost:

    #!/usr/local/bin/perl -w
    use Net::LMTP;
    my $lmtp = Net::LMTP->new('mailboxhost', 2003);
    $lmtp->datasend("To: postmaster\n");
    $lmtp->datasend("A simple test message\n");



This is the constructor for a new Net::LMTP object. HOST is the name of the remote host to which a LMTP connection is required. PORT is the port on which the LMTP service is running. Both of these arguments are required.

OPTIONS are passed in a hash like fashion, using key and value pairs. Possible options are:

Hello - SMTP requires that you identify yourself. This option specifies a string to pass as your mail domain. If not given a guess will be taken.

Timeout - Maximum time, in seconds, to wait for a response from the SMTP server (default: 120)

Debug - Enable debugging information


    $lmtp = Net::SMTP->new('mailboxhost',2003,
                           Hello => 'my.mail.domain'
                           Timeout => 30,
                           Debug   => 1,


Unless otherwise stated all methods return either a true or false value, with true meaning that the operation was a success. When a method states that it returns a value, failure will be returned as undef or an empty list.

Returns the banner message which the server replied with when the initial connection was made.

domain ()

Returns the domain that the remote LMTP server identified itself as during connection.

hello ( DOMAIN )

Tell the remote server the mail domain which you are in using the LHLO command. Since this method is invoked automatically when the Net::LMTP object is constructed the user should normally not have to call it manually.

etrn ( DOMAIN )

Request a queue run for the DOMAIN given.

mail ( ADDRESS [, OPTIONS] )
send ( ADDRESS )
send_or_mail ( ADDRESS )
send_and_mail ( ADDRESS )

Send the appropriate command to the server MAIL, SEND, SOML or SAML. ADDRESS is the address of the sender. This initiates the sending of a message. The method recipient should be called for each address that the message is to be sent to.

The mail method can some additional ESMTP OPTIONS which is passed in hash like fashion, using key and value pairs. Possible options are:

 Size        => <bytes>
 Return      => <???>
 Bits        => "7" | "8"
 Transaction => <ADDRESS>
 Envelope    => <ENVID>
reset ()

Reset the status of the server. This may be called after a message has been initiated, but before any data has been sent, to cancel the sending of the message.

recipient ( ADDRESS [, ADDRESS [ ...]] [, OPTIONS ] )

Notify the server that the current message should be sent to all of the addresses given. Each address is sent as a separate command to the server. Should the sending of any address result in a failure then the process is aborted and a false value is returned. It is up to the user to call reset if they so desire.

The recipient method can some additional OPTIONS which is passed in hash like fashion, using key and value pairs. Possible options are:

 Notify    =>
 SkipBad   => ignore bad addresses

If SkipBad is true the recipient will not return an error when a bad address is encountered and it will return an array of addresses that did succeed.

to ( ADDRESS [, ADDRESS [...]] )

A synonym for recipient.

data ( [ DATA ] )

Initiate the sending of the data from the current message.

DATA may be a reference to a list or a list. If specified the contents of DATA and a termination string ".\r\n" is sent to the server. And the result will be true if the data was accepted.

If DATA is not specified then the result will indicate that the server wishes the data to be sent. The data must then be sent using the datasend and dataend methods described in Net::Cmd.

expand ( ADDRESS )

Request the server to expand the given address Returns an array which contains the text read from the server.

verify ( ADDRESS )

Verify that ADDRESS is a legitimate mailing address.

help ( [ $subject ] )

Request help text from the server. Returns the text or undef upon failure

quit ()

Send the QUIT command to the remote SMTP server and close the socket connection.


Net::Cmd, Net::SMTP


Les Howard <>


Special thanks to Joe Minieri and ommTel ( for providing the impetus (and funding) to get this module created.


Copyright (c) 2001 Les Howard. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

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