[Help] Unable to send mail via SMTP in cPanel

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http://forums.cpanel.net – Hello, I am using a PHP script to send mail to a server via SMTP(Remote host is cPanel), but I get the following error while I sending it: Quote: 503 AUTH command used when not advertised. Then I failed to send mail, I found that it is possible to send mail to other servers that not use cPanel, the following is the code: PHP Code: <?php/**** SMTP4PHP :  SMTP for PHP* This project is a collection of PHP 5.3+ classes, written in OOP style, * providing&n (HowTos)