ok, i may be missing something here, but dont modern mail senders require you to authenticate first? ie: 

$l_mailer->auth($smtpuser, $smtppassword);

[download]
before 
$l_mailer->mail($p_sender);

[download]

In reply to Re^3: Net::SMTP - Connection to local MTA refused by huck
in thread Net::SMTP - Connection to local MTA refused by Robidu

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