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I send a mail to a person. How I can keep track of when that person opens the mail?

Mar 20th, 2008 17:07
ha mo, Edwin Chan, vincent b,

You need to use the Disposition-Notification-To: header to handle.
For example:
  mail("[email protected]","Subject","Message", 
       "Disposition-Notification-To: [email protected]\r\n");
You can, if you wish to, use procmail to further handle the return