Not sure if MIME::Lite supports authentication.

Try Mail::Sender by jenda. It supports authentication to the SMTP server. 
$sender->MailMsg({
   smtp    => 'mail.server.com',
   from    => 'somebody@perlmonks.org',
   to      => 'tcf22@perlmonks.org',
   subject => 'Sample',
   msg     => 'Mail Sender Sample',
   auth    => 'NTLM',
   authid  => 'tom',
   authpwd => 'pass'
}) ||  die "$Mail::Sender::Error\n";

[download]
Update: Added Code Sample.

- Tom

In reply to Re: Send an E-mail using NET::SMTP by tcf22
in thread Send an E-mail using NET::SMTP by Zitoune

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