i have recently installed Easy PHP 1.7 (http://www.easyphp.org/) (Apache 1.3.27 - PHP 4.3.3 - MySQL 4.0.15 - PhpMyAdmin 2.5.3 on Windows XP Professionnal SP1) and i have installed Phorum 3.4.6 (http://http://phorum.org/)

there is an option on the forum i installed which send a forgotten password to a recipient email but when i submit it i get this message error : "Warning: mail(): SMTP server response: 550 5.7.1 Unable to relay for in c:\easyphp1-7\www\fashionbug\forum\include\userlogin.php on line 364."

my isp is NTL
in the php.ini i entered their smtp server (smtp.ntlworld.com).

What is wrong ? i was told that it was the rignt setting to enter but that the probem comes from that i have windows instead of unix.

Any tips please ??