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SMTP Problem

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I am trying to test the following simple mail script.

$to = "opv1419@yahoo.com";
$subject = "Test mail";
$message = "Hello! This is a simple email message.";
$from = "me@mydomain.com";
$headers = "From: $from";
echo "Mail Sent.";

But I get the following error:

Mail Sent.PHP Warning: mail(): SMTP server response: 550 Invalid recipient: opv1419@yahoo.com in test3.php on line 7

I have my php.ini file configured to use SMTP port 2525, which is the port used by my mail server,and I have this port assigned as available to my localhost on my router.

Any suggestions?

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