There's a problem with Phpmailer e-mail

Require_once (' class.phpmailer.php '); The downloaded file must be placed in the directory where the file is located
$address =$_post[' address ';
echo $address. "
";
$mail = new Phpmailer (); Set up a mail sending class
$address = $_post[' address '];
$mail->issmtp (); Send using SMTP mode
$mail->host = "smtp.163.com"; Your enterprise Post office domain name
$mail->smtpauth = true; Enable the SMTP authentication feature
$mail->username = "*********@163.com"; Post Office User name (please fill in the full email address)
$mail->password = "********"; Post Office password
$mail->from = "******@163.com"; Email Sender Email Address
$mail->fromname = "";
$mail->addaddress ("$address", "QQ"), or/or the recipient's address, can be replaced by any email message you want to receive,
$mail->subject = "phpmailer test mail"; Message header
$mail->body = "Hello, this is Test mail"; Message content
$mail->altbody = "The body in plain text for non-html mail clients"; Additional information, you can omit

if (! $mail->send ())
{
echo "message failed to send.

";
echo "Error Reason:". $mail->errorinfo;
Exit
}

echo "Mail sent successfully";
?>

Warning:preg_match () [Function.preg-match]: compilation failed:reference to non-existent Subpattern @ offset 626 in C: \ Program Files\apache software foundation\apache2.2\htdocs\class.phpmailer.php on line 667
Message delivery failed.
Error reason: Must provide at least one recipient email address.

Reply to discussion (solution)

$mail->addaddress ($address, "QQ"); So what?

$mail->addaddress ($address, "QQ"); So what?
No, you tried, okay?

Echo $address; What is the value

Output your $address Look, may not be the correct email address

Output your $address Look, may not be the correct email address
I already have the output, and after I change it, there's a new problem.
Could not instantiate mail function. Message delivery failed.
Error reason: Could not instantiate mail function

Echo $address; What is the value
That is to see if my mailbox has errors, the result of the output is my mailbox

$mail->smtpdebug = 1; Plus this sentence to see if we can find the reason

$mail->smtpdebug = 1; Plus this sentence to see if we can find the reason
No, the result is could not instantiate mail function. Message delivery failed.
Error reason: Could not instantiate mail function.

Whether your 163 account is a valid account. Try QQ mailbox can send?
$mail->addaddress ($address); Try this.

Whether your 163 account is a valid account. Try QQ mailbox can send?
$mail->addaddress ($address); Try this.
No, I think it's not a coding problem, it's a php.ini configuration problem.

Whether your 163 account is a valid account. Try QQ mailbox can send?
$mail->addaddress ($address); Try this.
I found a few words on some websites, but I couldn't open the details.

Email error:could not instantiate mail function this is actually caused by our improper settings, background email settings require us to this kind of: name if not set ...

I also encountered the same problem, in the win environment debugging is completely normal, transplanted to centos5.9 this is the case
Invalid address:12336@qq.com message sent failed, error message: You must provide at least one recipient email address.

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