Warning: mail() [function.mail]: SMTP server response: 503 Bad sequence of commands

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Hi,
pleae help me how to solve this error.

Warning: mail() [function.mail]: SMTP server response: 503 Bad sequence of commands

$to = $email;
$from="------@gmail.com";
$subject = "Payment Info";
$message = '
<html>
<head>
<title>Payment info</title>
</head>
<body>

Here is your payment information

Name :	'.$name. '
Amount :	'.$amount. '

</body>
</html>
';

$headers = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";

// Additional headers
$headers .= 'To:'.$to. "\r\n";
$headers .= 'From:'. $from . "\r\n";

mail($to, $subject, $message, $headers);

Posted 28-Jan-12 7:44am

chopoe

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Sergey Alexandrovich Kryukov · Answer 1 · 2012-01-28T08:00:00

I can see only one problem right now but I don't think it's a reason for this error message: you use $to twice: in headers and first parameter in mail. You should not add it to headers as it is passes as a parameter anyway, the function call will do it.

I don't know exactly what to reason of the error. Are you sure the mail is properly set up in your Web server's host? This is one of "relay" problems.
Please see this discussion:
http://www.kirupa.com/forum/showthread.php?95806-503-Bad-sequence-of-commands-!-![^].

—SA