Email-phpmailer sending mailtips SMTP server error What's going on?

Phpemailsmtpphpmailer

Here's My Code
The error message is:
SMTP Server Error:Error:send Helo/ehlo First
If you change the Smtpauth to True, the error is
SMTP error:could not authenticate. Mail ERRORSMTP error:could not authenticate.
What is the reason for asking the great God?
What settings are needed? Or is phpmailer used wrong?
Thank you!

function SendMail ($to, $subject, $msg)
{
Require_once "phpmailer/class.phpmailer.php";
Include (' phpmailer/class.smtp.php ');

  $mail = new Phpmailer ();//Create Instance $mail-charset= ' utf-8 ';//Set CharSet $mail-  > setlanguage (' en ', ' include/phpmailer/language/'); Set language type and language file directory $mail, ISSMTP (); Use SMTP to send $mail-Smtpauth = false; Set whether the server requires SMTP authentication $mail, Host = "smtp.163.com"; SMTP host address $mail Port = 25; SMTP host Port $mail, from = "ajw211@163.com"; Sender email Address $mail, fromname = ' ajw211 '; Sender's user name in the SMTP host $mail-Username = "Anthony"; Sender's name $mail, Password = "**************"; Sender in SMTP host password $mail-Subject = $subject; Message subject $mail-altbody = ' text/html ';  Set alternate display $mail, BODY = $msg when the message body does not support HTML;//message content made $mail-ishtml (true); is HTML mail $mail, addaddress ($to, ' zy10601 '); Recipient's address and name $mail, Addreplyto ($to, ' zy10601 '); The recipient replies with the address and name//$mail-addattachment (' include/id.csv ', ' att.csv ');//attachment path and attachment name if (! $mail->send ()) {echo " Mail error ". $mail->errorinfo;} else{echo "suucceed!!";}  

}
$to = $_post[' Toemail ');
$subject = $_post[' title '];
$msg = $_post[' content '];
SendMail ($to, $subject, $msg);

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