My email cfg params. changed the actual login and pwd to make anonymous for this

Hostname=smtp.bizmail.yahoo.com
Port=465

Auth=LOGIN
Username=sent@thefxxxxxxxxxxx.com
Password=xwrhkvjlhadadadsoisuei

I can telnet to smtp.bizmail.yahoo.com at both 25 and 465.

$telnet smtp.bizmail.yahoo.com 25
$telnet smtp.bizmail.yahoo.com 465

So, their ports are open. Telnet from your PC and your web server. If you can telnet from your PC but not from your web server, you can bring the case to your web server administrator.

The following php code will test if you can connect to smtp.bizmail.yahoo.com from your web site.
Save it as a text file and name it as "test.php" or something like that. Upload it to your web site and open it in your browser. Let's see what message it returns.

<?php

$fp = fsockopen("smtp.bizmail.yahoo.com", 25, $errno, $errstr, 30);
if (!$fp) {
	echo "$errstr ($errno)<br/>";
} else {
	echo "connected successfully<br/>";
	fclose($fp);
}

?>