PHP uses SMTP to send mail Gmail met problem

2. <? PHP
4. Include("Class. phpmailer. php");// Imports phpmailer class to others
8. $ Mail=NewPhpmailer ();// Create a new object
10. $ Mail-> Issmtp ();// Set the SMTP mode for sending messages
12. $ Mail-> Smtpauth = true;// You need a license to set SMTP.
14. $ Mail-> Smtpsecure ="SSL";// The SMTP host of Gmail needs to use SSL authentication.
16. $ Mail-> Host ="Smtp.gmail.com";// SMTP host of Gamil
18. $ Mail-> Port = 465;// The SMTP port of the SMTP master machine of Gamil is port 465.
20. $ Mail-> Charset ="Big5";// Set the firmware Specification
24. $ Mail-> Username ="*********";// Set your certificate
26. $ Mail-> Password ="*********";// Set the certificate secret
30. $ Mail-> From = XXX@XXX.XXX.XXX;// Set the sender's mailbox
32. $ Mail-> Fromname ="Guest guest";// Set the sender's name
36. $ Mail-> Subject ="Phpmailer zookeeper letter";// Set the standards
38. $ Mail-> Body = "Hello everyone,
40. This is a Sort letter!
42. ";// Set the content of the firmware.
44. $ Mail-> Ishtml (true );// Set the firmware content to HTML
46. $ Mail-> Addaddress (David@e-happy.com.tw","Tea rice");// Set the recipient's fax and name
50. If(!$ Mail-> Send ()){
52. Echo "Mailer error :".$ Mail-> Errorinfo;
54. }Else{
56. Echo "Message sent! ";
58. }
60. ?>