The London Perl and Raku Workshop takes place on 26th Oct 2024. If your company depends on Perl, please consider sponsoring and/or attending.


Net::SMTP_auth - Simple Mail Transfer Protocol Client with AUTHentication


    use Net::SMTP_auth;

    # Constructors
    $smtp = Net::SMTP_auth->new('mailhost');
    $smtp = Net::SMTP_auth->new('mailhost', Timeout => 60);


This module implements a client interface to the SMTP and ESMTP protocol AUTH service extension, enabling a perl5 application to talk to and authenticate against SMTP servers. This documentation assumes that you are familiar with the concepts of the SMTP protocol described in RFC821 and with the AUTH service extension described in RFC2554.

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

The Net::SMTP_auth class is a subclass of Net::SMTP, which itself is a subclass of Net::Cmd and IO::Socket::INET.


This example authenticates via CRAM-MD5 and sends a small message to the postmaster at the SMTP server known as mailhost:

    #!/usr/bin/perl -w

    use Net::SMTP_auth;

    $smtp = Net::SMTP_auth->new('mailhost');
    $smtp->auth('CRAM-MD5', 'user', 'password');


    $smtp->datasend("To: postmaster\n");
    $smtp->datasend("A simple test message\n");



new Net::SMTP_auth [ HOST, ] [ OPTIONS ]

This is the constructor for a new Net::SMTP_auth object. It is taken from Net::SMTP as all other methods (except auth and auth_types) are, too.


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.

auth_types ()

Returns the AUTH methods supported by the server as an array or in a space separated string. This string is exacly the line given by the SMTP server after the EHLO command containing the keyword AUTH.


Authenticates the user USER via the authentication method AUTH and the password PASSWORD. Returns true if successful and false if the authentication failed. Remember that the connection is not closed if the authentication fails. You may issue a different authentication attempt. If you once are successfully authenticated, you cannot send the AUTH command again.

The AUTH method NTLM is supported via Authen::NTLM (thanks to James Fryman).


Net::SMTP and Net::Cmd


Alex Pleiner <>, zeitform Internet Dienste. Thanks to Graham Barr <> for Net::SMTP. NTLM authentication code provided by James Fryman <>


Copyright (c) 2001, 2003, 2006 zeitform Internet Dienste. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

1 POD Error

The following errors were encountered while parsing the POD:

Around line 181:

You forgot a '=back' before '=head1'